Worried about not having friends

I’m 21 and in college and about to be done, and I don’t have many friends because it’s hard for me to make them. I’m not a social person. And I’m worried when I get out into the real world with a real job, I won’t have much of a social life. I’m worried all I’ll do with my life is go to work and go home. I feel like my life is falling apart. I found out my ex cheated on me, and I feel alone and I have no one. I don’t know what to do