I feel lonely and don't know how to process it

I'm really struggling with my emotions a lot recently and its becoming worse. Im 17 currently and about to turn 18 in September. I have no girlfriend and not many friends

The thing that i feel bad about is that i have friends, multiple people i interact with at school but i just don't feel fulfilled

I love my friends a lot but they don't share much in common with my. Im a big nerd and i hyperfixate and like a lot of things but this as the unfortunate side effects that when i talk i tend to annoy people, my friends aren't overly interested in the things i like so i just stay quiet a lot.

I have 1 IRL Friend who shares some interests with me, the person i considered my best friend for 3 years but recently he's just not been interested in me, we don't share any classes and he has ne friends. He makes no effort to seek me out, engage in convos and rarely invited me over. I have 2 close online friends that allow me a space to talk about things i like but it isnt fuffilling

Im a very social person, i want friends who i can see movies with, talk about the things i like and even go out and about with. Howeevr nobody i know likes that stuff so i just spend all my time in my room. Just socialising online makes me feel depressed asf after ages because i want to do more with my life but i can't stand my own company all the time.

I also feel guilty being mad at my friends because they aren't obligated to like what i do but i just feel like nobody cares about me. Nobody WANTS to be around me, or enjoys my compant and they certainly dont want to invite me to do things with them. I wanna cry sometimes, i bottle this all up and never discuss it aswell which certainly doesn't help.

I see people at school i want to try and be friends with but every time i try to be friends i just get awkward or they never seem interested. Plus i don't want to end up in the same issue of being friends with people i have nothing in common with but at the same time i dont KNOW anybody who shares my interests. I also want a relationship but my personality and weight don't lend well to that, the last relationship i was in was almost 3 years ago now, i know some people might think wanting a relationship to not be lonely might be weird but i miss having that person i connected with, that enjoyed me as a person.

I just want to feel the effort i put into other people and nobody will give me that and i don't know why. I've even gone to conventions to make friends and its never worked. I know part of it is probably me being too full on or even too nervous sometimes

This is the first time ive ever vented my feelings. I see other people with friend groups that click with them and i havent had that for years and i just miss it. I miss feeling as if people liked me