You'll be exposed to people even if you don't seem social, it's inevitable! When I went travelling, everyone was extra friendly and didn't pick up on my anti-social tendencies which really increased my confidence. I would be careful travelling with friends, I went with my closest friend and we feel so comfortable and hardly ever argues, so it was all good. My one friend went to India, she got sick for 3 days and her friends just left her there alone because they were bored....
I think it will give you a perspective, but travelling can be SO stressful. So I'd identify potential possibilities for this and CHILL.
Personal tip- In my experience I find food to be a huge argument-starter/stressor. Everyone disagrees on where to have it, and then get really cranky. Just be warned haha
Good on you for going ahead with this possibility! I'm going on holiday in summer too, super excited!