Everyone around me is really starting to misunderstand me because of how quiet and reserved I am.

I'm not shy or autistic or anything like that, I'm perfectly capable of normal and meaningful conversation, but I've basically just stopped interacting with my friends when I'm around them. I sit there and listen and respond whenever I'm spoken to. I really just can't relate to what they're saying anymore because their maturity levels are so dismal. Now everyone's begun to see me as a huge dead weight and gradually they've all become weirded out by me. Naturally, also, there's really no way to fend for my reservedness in that capacity.

I know the obvious answer is to 'get different friends' or to hedge myself for lack of a better word but I can't deal with being dishonest like that and I really don't want to be that guy who's main group of friends are all like 10 years older than him.

Everything around me just isn't appealing or stimulating. Even the most exciting things like emotions and sex. I'm not depressed. I honestly just find these things super boring, without repair.

I know I probably won't get too much in the way of solutions here but whatever. Someone tell me what's actually wrong with me.