Sexuality and Dating

So personally I’m so confused with myself and I need some help. So I’m 21M but for the last 8 years I was watching porn pretty regularly. Not watching for hours but almost daily for 20 minutes. I just recently stopped watching porn a week and a half ago. I’ve always found guys cute or good looking but never had a sexual attraction. On the other hand, I remember getting hard when I was younger when I would see a girl boobs or ass in a movie. The funny thing is, I’ve never had the desire to ask a girl out. I notice they are pretty but just move on. Would you consider me straight or bi?

As a guy, when you like someone do you have to get hard when looking at her or are there other things that can tell you like her? I’m positive the years of porn has messed up my head and this may seem like a silly question. I’ve never been in a serious relationship or had sex and I’m also an awkward introvert so that doesn’t help.