Why am I scared to be close with my dad?

Bri 🌺✨ • 21
I've never been that close with my dad. He's an alcoholic and we don't really ever get along. The odd time that we do get along, you can bet it doesn't last and that it ends in a full blown fight, with him usually punching something (don't worry, never me or anyone else).
I've always been super jealous of my friends who are either just okay with their dads, or even better, really close. But at the same time, it makes me uncomfortable when my dad tries to get close with me. Sometimes when he's drunk and in a really good mood, he'll try to hug me and it actually kind of creeps me out. 
I don't know why I feel this way, and I know my dad would be really hurt if he knew that's how I felt, but I can't help it and I don't like feeling this way. It's not normal to feel uncomfortable giving my dad a hug. I don't even say "I love you" to him, because it scares me and makes me uncomfortable. 
Am I the only one like this?