UTI? Maybe?

I have a feeling in like the opening of my vagina as if I was dry during sex and I got a little torn. I also saw a little bit of blood once when I went to the bathroom today. I’m 100% sure it isn’t an STI because my boyfriend and I have only both ever had sex with each other so neither of us could have it, also we haven’t had sex in a few weeks. Could this be a UTI?