Wrong Choices on purpose?

I realize when I'm making bad decisions that I'll regret later, but when am I going to realize nothing good comes from them? Do people like making "bad" decisions or give into temptaion because it's more fun than being bored. I guess that's my problem. I guess I like to choose  guys who aren't available or who I would never see a future with because it's "safe" from any emotional attachment. Because with emotional attachment comes hopes and when hopes are let down comes dissapointment. I must have a fear of rejection or just a huge wall up because oh my goodness maybe there actually is decent guys out there. This is nothing new for me, but the older I get the realize I need to man the fuck up and grow up and actually put myself out there to give these dudes a chance. Just because they have horrible fashion sense, doesn't mean they don't have goals in life. Just because he's short doesn't mean hes not funny. Just because he's shy at first doesn't mean he's a failure at life. I always manage to find something wrong with any "potential" dude. And let me tell you, it's starting to eat at me. I'm gonna be single for life if I continue this. Yikes.