There's people on US campus that just try and sell you stuff/recruit you? That's so weird. (// ⁠▽⁠ ⁠•⁠;⁠)

I don't know if I can even add anything since it seems your way of life is so different. Well I guess I can recommend to try and get a small source of income so you can buy yourself trinkets and such. Also, if something isn't mandatory, don't feel bad about not going. That also applies to clubs or groups. No one will be mad if you decide for yourself that a social activity isn't for you after all (⁠ // ⁠‿⁠ゝ⁠◡⁠`⁠)