How do I start having fun again?

To start of, I read about forbidden topics and saw the note about "therapizing or counceling" but I really seek advice for what to do more than to actually have some online therapy session.

By now I'm 18 years old. I have a great social life, and even though I still havent had my first kiss or anything I actually don't seem to have a problem with having girls flirting with me and/or approaching me. I'm really just the type of guy who talks alot and try to be nice and respectful to anyone I meet. I regularly do stuff too and I always do stuff when I'm invited and I regularly go enjoy parks and walking and that sort of thing.

Now, reading about that one might conclude that I've got everything figured out. But although I'm thankfull for my social skills and all there is still a lingering problem underneath:

I just can't have fun.

It's not that I can't enjoy something, which I can, it's just that I haven't had actual "fun" for a long while.

I think that I'm the type of guy who has to have everyone around me have fun for me to have fun. And not to blame it on everyone else or anything but it seems like people have the exact same problem that I have because I can go to a club and be the only one actually dancing like crazy like one would expect people do at clubs so it ends with me just being laughed at and stuff.

But at the end of the day this is my problem and I can't just blame it on them like that.

I've tried having some hobbies. I enjoy gaming, I play a bit of CS2, a bit of Minecraft, a bit of hoi4 and generally just play with friends. I have also tried going to the gym but since I don't really seek "the perfect body" it wasn't for me. I have tried diffrent motor sports, wasn't really for me. Really I'm more of a reader and I like reading about science, history, politics, nature and a bit of everything and though I enjoy it, it isn't really that fun and it's more of a thing I do while being bored on the metro or whatnot.

And that's the thing really. I either have slight enjoyment, neutral feeling, slightly bad, bad, or shit feelings. I don't get like really happy.

And the weird thing is I don't think drinking is fun either. Of course I enjoy it, slightly, but it's the same deal here and with many other alternatives.

And maybe it's good to mention that I don't really have any mental issues that I know of. I'm not really insecure in myself or anything altough maybe I have some "afterglow" of insecureties I had as a kid.