Should i hang w this guy? Why am I always lonely?

I really want a boyfriend and I don’t know how to accept the fact that I’m single. I’m a sophomore and so many couples seem happy it’s just hard for me I’m constantly waking around and wishing I had a boyfriend. Is there something wrong with me? I don’t get it but there’s just this sadness inside of me because the only type of guys that ever hit me up just wanna fuck me. My brother told me that even if you’re in a relationship that’s what it’s mainly about but I’m supposed to hang with this guy on Friday and I don’t know what’s gonna happen he said he wants to hook up but its not just a one time thing and I don’t know what to do!!