I don’t know; I have traveled alone and end up going the whole trip without talking to anyone, so I don’t think it forces you to be social if you aren’t trying.
In day to day life I have a tremendous amount of social anxiety. When traveling alone I feel free to be open and generally ridiculous as the repercussions of a social faux pas are limited.
I guess it depends on why you are introverted; for me, I actually don’t have any social anxiety. I feel very comfortable being myself and am not worried about what others think. I choose to be alone because I enjoy it and it relaxes me.
