How do I to become less of a paranoid prude?!?

I'm in college. I don't like to party. I've become standoffish. I don't really know how to have fun anymore. I have a lover. I get upset when they drink or get drunk because I'm afraid of what will happen (ex. saying things I don't wanna know about, flirting, or cheating or something) and I get annoyed by how obnoxious it is. And I feel inferior because of my lack of desire to participate in such things, but at the same time I don't want to become unbearable. How do I balance this in a healthy way?