What do you do when you feel lonely?

I’ve been feeling very lonely for a while. It usually doesn’t bother me, but lately it’s been making me very sad. I have no one to talk to half of the time and the people I do talk to, I think they don’t like me and don’t like talking to me. What do you do when you feel alone and no one seems to make you feel like someones there? Even when I’m talking to people, I’m lonely. :(