I wanna get into drinking

I am european and every time there is a get together I am the only sober one and I’m tired of it, if I manage to drink two beers I usually go to bed. My tummy doesn’t like it and sometimes I even get a headache, there are a few types of drinks that taste good but most of them taste horrible.

Can u give me tips? I don’t want to be the sober or asleep one at every party and casual get together 🙁