Sucks to be lonely

I'm 23 years old, have been single for a little over a year & lately I've been feeling really lonely. The guys I've met since being single are mainly just interested in sex. I don't feel like I'm giving off the easy vibe because that's not who I am. I also have no real genuine friendships. Not sure if the problem lies with me or maybe this is just one of those tough phases you go through. This loneliness has been messing with my confidence a lot too. How would you deal with feeling like this?