Optimism in itself is not bad.
I think a better concept to strive for is "hope". Optimism can help to reorient a mindset to look at things more positively so it's a useful means to an end. However, hope (to me, at least) runs deeper and is a better source of strength in hard times. We hope for many things...and by hoping we can form images in our mind of the outcome we want and apply efforts towards them.
I'm sorry to hear that you were in such a hard place. With the Sun in Scorpio, it shouldn't be surprising. My wife has her Sun there, too, and she had to experience the premature death of her brother (who was shot). I explained to her that sometimes, with Scorpio, it feels like the journey of life will take those people to some very dark places. Death, in one form or another, is no stranger to Scorpio...as is the depressing emotional depths that they can reach in especially hard times.
But remember that conjunction of Venus to your Sun: relationships are a key here, too, so don't feel like you have to do it alone. You may strike out a lot of times in the area of relationships but, when you
do find those people who you can connect with on that deep level, it should prove to be highly rewarding.
If I recall the birth date on your chart correctly, you are actually still quite young. You have time to realize your dreams as long as you put in the work and efforts toward them.
I recall reading something by Liz Greene (I believe she was the one who wrote this) which indicated that the Ascendant is like the journey/training a hero must go on/through while the Sun is what the hero is striving to become. With that Capricorn Rising, dealing with delays, obstacles, etc., may be part of that training you need to go through in order to reach the potential latent in your Scorpio Sun.
Capricorn asks not only hard work but the patience to allow things to blossom in their due time. That Aries undertone may be adding a touch of impatience here. The key is to allow that Aries influence to help add momentum to Capricorn rather than bashing your head against a wall the way a wild ram would.
Capricorn/Saturn also tends to be of such where it's difficult in youth but something you grow more comfortable with through the passage of time.
Wanting to channel that into an aim or goal is definitely the right direction to go in. However, I would encourage you to avoid mindsets like "But Sun-Saturn has always tried to limit my self-expression" or "I knew the Moon was the culprit!". The planets, signs, houses, etc., are merely symbols for those things that live within us and how we experience them. When I see that statement in light of that, then I hear, "My fears / doubts / anxieties (Saturn / Sun in Scoprio) are limiting my self-expression."
Do you see what a difference that makes there? The planets are massive bodies that travel through space and that creates a more impossible and intimidating image. However, when you own those yourself it makes it more feasible to identify and address them. Basically: "I'm anxious, unsure and maybe scared. Those are my feelings. But they don't have to hold me back!"
Relating isn't always easy. Two or more people come together and what's happening is that views, baggage, feelings, etc., may be clashing. It's inevitable that we will, at some point in our lives, come into contact people who are so different that a clash is likely to happen. You may also want to consider the possibility that your fears and anxieties are causing you to project a scenario of alienation that may not objectively be happening in some of those cases.
I don't know you well enough and I haven't observed your situations to know what is happening here. However, one of the things to keep in mind where the Moon is concerned is that it represents a part of our experiences and living that isn't logical or rational. Even if that Moon falls into an Air sign, the Moon's nature itself is not objective. Rather, it is subjective and prone to our emotional ups and downs.
I can give you an example. I have my own Moon in Libra. An Air sign, right? Well, I've had moments where I've felt an irrational frustration or upset because someone didn't treat me as I had treated them. Libra's energy which calls for balance and fairness, is crying for that need. And when other people don't give that, it can get under my skin.
If I give myself space and time to think on it, I come to the conclusion that not everyone will give back what I give to them. And I have to live with that. That's just people and I can't control what they do. I can only control what I do and how I feel about it.
In your case, it might be good to take a step back and to understand that not everyone will be able to connect with, or understand, you in the way that you want. You are what you are and, if that's the case with some of those people, then it's a matter of understanding that and there are people out there who may understand you better.
With that Sun in the 10th, I wouldn't be surprised to hear this. This can signify a need to express and be acknowledged on a public platform. I see an artistic public performance tied in nicely with a Libra Midheaven with its ruler in the 10th House conjunct the Sun.
It would also be a nice productive outlet for Scorpio's intensity and depth rather than it festering and tearing at you relentlessly. Translating those deep, tumultuous emotions into song/performance can result in a stunning and haunting show. Sometimes it can be easier for people to express themselves in such ways as opposed to talking about them.
Eh...I'm not an expert in nutrition or health, but I'm pretty sure
just eating oranges for three days isn't a good idea. They're acidic and, with nothing else in your stomach to help with some of that citric acid, I'm pretty sure that can be bad. As far as questions of nutrition and diet are concerned, I would do research and talk to your doctor. Everyone's body is different and finding the right diet for you is personal and best done with the assistance of your doctor for your health and safety.