Feeling lost and inferiority complex - how to solve it?

Hi, there!

I'm struggling with these problems since covid ended, so we got back into normal highschool classes.

That year (2022), I got 18, and I celebrated it only with 3-4 friends, where I knew only two from highschool class. After class reunited, I wanted to socialize more, but my capacities for it were modest - I was a person, and now I'm who likes to talk about psychology, history, politics, music, so these were my primarily interests. I only know two friends who share same interests as me, and I'm honestly good with them.

Also, I think I'm worser than other people in many areas of life, even when I'm doing things that makes me successful such as volunteering and deep studying. That issue has cancerous impact on my relationship with females - I have fear to talk with them because I won't interest her. Almost everytime when I want to talk with them I have fear to talk or she shortly after approaching leaves me. I really had been lucky only with two which I kept contact for more than 2-3 years, but I'm insecure about future - will she continue to hang out with me?

I don't know how to approach girls and to talk with them. From which subjects to start, and how to be secure that she don't think I'm boring. Need help.