How to be interested in people

I broke up with my boyfriend two years ago, my friendgroup and his’ became one. After we broke up, my side of the friendgroup stopped talking to me, I don’t know why. So I was left with no friends.

Then I went to Uni and made 2 friends separately. Now I know that both of them are failing and are going to drop out. So in those 2 years I only met 2 new people and I couldn’t even call them friends, more like acquaintances and now they are soon to be gone as well (they live in another city).

I am scared to show interest in people and put effort into a friendship because I am always left alone. (I tried everything with the new people from uni but they were not that interested in me, probably because I got boring now?)

My only friends are my sister and parents and it is depressing seeing other people my age having fun with their friends.

Next year I want to study in the library, because it seems like a good place to find friends.

My problem is that I don’t know how I could approach someone without them feeling weird about it. I lost all my social skills, I used to be so talkative that I made friends out of anything and now I can’t even hold a casual convo for 2 minutes.

Or how should I even talk to someone that approaches me??

I get so shy and awkward now like I turned into someone else. And I feel like a boring person, but I was never like this, so I don’t get it.

Please help, I feel so alone, I want to have natural friends again, I leave my house like maybe 7 times a month?! that’s really not been healthy for my mental health these past years.

If anyone could share even 1 trick I would be so thankful