Why does this happen?

I don’t drink much, but I’ve noticed every time I do I seem to have a different experience with the “buzz” than everyone else. Instead of the apparently good feeling I just get dizzy, my head starts to hurt, and my nose bleeds. My research only seems to connect these symptoms with excessive drinking, where as this happens after half a bottle of a wine cooler for me, so that can’t be it. People have told me “that’s just the hangover” but I don’t believe you’re supposed to be hungover before you finish a bottle.