The first influence that I thought of after reading your post was that of the ninth house; the kind of experience you are referring to ("traveling the world, and visiting new places") seems to perfectly
describe the ninth house, and by association, perhaps Jupiter and Sagittarius as well.
Sure enough, you've got an exalted Jupiter in your ninth house! The impressive Capricorn stellium may not seem to indicate the type of person who "sends people off on their vacation while you stay behind", but I believe this position of Jupiter says the exact opposite.
I like looking at Sabian symbols, and I believe the one for your natal Jupiter is particularly revealing:
Cancer 4: A cat arguing with a mouse.
In other words, you have feel the need to justify your Jupiterian craving for exploration, to use the conversation and rationalization skills your third house stellium may have bestowed upon you; remember that the third house is typically associated with Gemini using the astrological alphabet (i.e. Aries = first house = Mars). However, while Libra is a lovely Ascendant, it has the peculiar characteristic of "flipping around" or "reversing" a lot of the natural sign/house correlations, since Libra is the opposite sign of Aries.
This isn't a bad thing, but it gives me the feeling that your third house stellium, while in Capricorn, secretly wants to be a ninth house stellium. In fact this kind of Gemini/Mercury and Sagittarius/Jupiter conflict is present in your chart with an opposition aspect between third house Mercury--a strong placement, since the third house is associated with Gemini--and Jupiter--another strong placement, as I mentioned earlier, since the ninth house is associated with Sagittarius. I know these are both cadent houses, so some may argue that these planets have accidental debility instead of accidental dignity...but I disagree in this case because it seems to highlight the natural tension you may feel between staying local
(i.e. third house) and international traveling
--or other ways of living a life of adventure.
Not to mention that you've got a rather adventuresome Mars in Capricorn.
Here's an excerpt of an interpretation of Mars in Sagittarius
from Cafe Astrology
; visit the link if you want to read the entire interpretation.
They abhor anything that fences them in. They need to feel like they have space. They're the ones who will run away when things get too serious or dull. They'll likely be back soon--it's just that they need to feel free for a while or they go batty.
Here's another excerpt of an interpretation of this same Mars in Sagittarius
placement, this time from Astrology-Numerology.com
; again, if you want to read the entire thing, click on the link.
Jupiter in the ninth house
For you it is unrestricted freedom at all cost, with rhythm and tempo that comes naturally to you. You are a person with a zest for adventure and having a good time. You have trouble sitting still for very long, and you want to be on the move physically.
, from this same site, seems to express the same thing. Since the interpretation is short, I'll post the entire thing here:
Jupiter in the ninth house suggests that the planet plays an important part shaping a far reaching view of such weighty issues as philosophy, religions and higher education. You are likely to seek as much education as you possibly can, and because of your knowledge, you may well become a teacher in some phase of higher education yourself. You are likely to travel extensively, and you will benefit from these travels in a variety of ways.
I'm sure there are more influences I could discuss and interpretations I could include here, but I believe you get the idea. Your chart's more adventuresome and travel-loving than you thought