Made fun of and almost always the butt of the joke of my friend group

I’m a high school student, and I have 3-4 friends who I hang out with every day. When I first met them about half a year ago, they all really respected me and I wasn’t made fun of. It started off as light friendly jokes, which is how most friend groups talk with each other. They got more toxic over time and maybe it’s because they thought I was awkward or weird. Now, a lot of the time when I try to say something, they shoot it down and just laugh at me (not with me) and sometimes just tell me to stfu if I say something completely normal. I don’t know what it is about me that makes me the butt of 80% of my friends’ jokes or why I can’t make new friends and talk to people as easily as other guys. I notice that the same people that are rude or obnoxious towards me are nice to other guys. I’ve tried to improve my confidence and social skills but it’s gone to waste because I’ve seen no results.