Being Single

In a few months I'm going to be a senior in college and I haven't been in a relationship. And it's also because I say No to the guys who ask me out since I don't like them. I always knew that if I clicked with a guy I'd date him if yall understand what I mean. I haven't had a problem being single before but now I'm wondering whether I should just date whoever is available because being single and seeing couples around me, the feeling sucks so bad!