I just posted a long post about how I feel lonely, so it's not just you who feels this way
I have social anxiety but I try not to let it show - people just think I'm an awkward human being lol
I'm actually quite similar to you in the sense that you want to travel the world but aren't into partying or drinking as such. I'm sure you'll find friends that will understand you (I haven't found good friends yet, but I'm hoping that one day in the future I will do - besides, we have plenty of time!)
So yeah, I can resonate with what you are saying about socialising etc, and it's hard. I'm not going to lie and say that I forget about it when I come home from school (I won't go deep into it, as I mentioned before, I posted a whole post on it!), I feel really down sometimes, especially when I feel super lonely at school.
It may seem weird, but I feel more comfortable and I feel less lonely when I'm in my room reading a book or watching tv or something, as opposed to when I'm at school, where I feel extremely lonely most of the time. I'll try to give you the best advice I can, considering I feel just like you:
Try to preoccupy yourself with a hobby of some sort that takes your mind off of what is troubling you (mind you, I know it's harder than it sounds, but it's worth a try, right?). It's good that you've said how you feel, and, at least for me, letting my feelings out makes me feel less awkward and lonely or whatever.
I'm sure everything will turn out ok - after all, what's the point of having friends that don't accept you for who you are? I'm sure that you will find good friends in the future who share the same interests as you etc.
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