Hi Andonis, oh well, my daughter is a prime example here: Sun in Aries, Asc. in Leo!! Sun in the 10th, Mars in 11 in close conjunction with Venus and Moon in Gemini and their ruler again in Aries!.
Friends are her life and are the only people that might be slightly more important than her good own self. However, I dont see her as egoistic even though I am sure that she can behave in an egoistical manner (who doesn't?). She is extremely generous, giving very expensive presents to all her friends and family members, so really not much "me, me" there, BUT, she is thinking 99% of the day about herself and her daily problems. She can come and visit and just be in another world (her own), worrying, thinking, you name it. Sits down, takes a magazine and that is it. No real interest. Possible that she feels sooooo at home that she forgets her manners a bit.When she calls me, I hear that she continues working on her computer for instance, doing two things at the same time, so not giving her full attention. She only gives full attention when the subject of the conversation deals with her and her problems or is intellectually challenging enough for her, otherwise, mmmm.... So in that respect she is an egoist.
My son is Sagittarius with Sun, Mercury conjunct MC in 10th house.
Now, he, I find, is far more of an egoist than my daughter is. He usually calls when he needs me or my car. When I ask him if he can do something for me, usually sorting out a computer problem (after all he is the expert), he does so reluctantly, even though I helped him no end over years, psychologically and financially. He knows that, also says repeatedly how much I helped him, but when he does something for me, it is ONLY because I helped him in the past, not because he really wants to stick his hands out of his sleeves to help me regardless, let alone suggesting "can I help you with something mom?". He still has to learn a lot when it comes to "unconditionally" help someone.
I always tell them what I think of their behavior, they must realize and learn to change these habits. My daughter then laughs a bit sheepishly and says "yeah, you're right" and my son says" I know mom, but do you know how dreadful it is to ALWAYS be asked to fix computer problems??? Oh well, all in all they are great kids and I count myself very happy to have those two.
Another Sagittarius is the daughter of my partner. Same thing- She only calls her dad when she needs money or help with something. Otherwise he can go without any news for weeks on end.
I think we have to look at the Moon positions as well and their aspects. If planets are placed in "helpful signs" or hemispheres or not. All sorts.
Everybody has something egoistic in him or her. The chart can show how serious it is.
Cheers, Star.