Are humans meant to be this lonely after high school?

Ever since I graduated high school a couple of years ago, I realize that I can't make friends as easily. When I was in high school, I was heavily bullied so I wasn't able to have any friends. Now that I'm an adult I realize that people have no time to make friends anymore. Either that, or they won't make time in their lives to hangout with me. Is this what it's like being an adult? Or am I just cursed with bad luck?