I have no friends

Hi all! So a bit of a background. I'm 23 and in college right now, and had a best friend for 17 years, who due to unfortunate circumstances, no longer am friends with (for 2 years now.) And while she and I were friends, it was hard to be friends with others because she was possessive and got jealous. However, now it just feels like no one likes me and I don't have any friends. I don't have anyone I can hang out with. Most everyone I know is in school, or married, or has kids, so I'm never one to ask them to hang out because I know they have busy lives. And I'm currently dealing with medical issues within the family, which makes it harder to since complications spontaneously occur. I would like to and very much wish that I had at least one close friend again, but it's starting to feel hopeless 😔