Feminized? I don't think so.
>26
An age in which you start to grow up seriously.
>feeling less angsty
>no rock nor metal anymore
You can't be angered forever. You can't be in a constant state of internal war. In an interview in Lords of Chaos (the book about Black Metal), the lead singer of a band (can't remember which) said that "you can't live in a perpetual state of war. It's not sustainable in the long run".
Happened the same to me. The more I grew up, the less I listened to metal (shifted to hard rock and less extreme genres). I'm 33 now.
>don't lift weights as much
Probably you don't see a reason to do that anymore. Think why you did it in the first place: was it for your own good, or was it related to the world outisde you? Maybe there's something else you'd like more. I.e., I quit lifting years ago, and started to do bodyweight.
>sex drive slightly lower
That's normal, with years passing by.
>never drink or do deviant or destructive things
Same reason: you're growing up. There's a point in which you realize that destructive things are a waste of energy. When you're a teen, you've got plenty of energy and plenty of free time: so, you can afford to waste some. Now, you have less time and less energy: you can't waste it in stupid things. Also, the mindless destructive things are typical of teenage angst, from which you are coming out.
>oil paintings, KPOP, classical music, hikes, pottery, etc.
You're just switching hobbies. You're starting to find those things more satisfying. what's the problem? You're starting to enjoy things that you previously didn't.
>skin care and superficial things
Taking care of yourself is not superficial. You need to love yourself. Taking care of yourself is a sign of good mental health.
>paying more attention to social status
Again, it's growing up. You're feeling you want to find your place in society, so you pay attention to that. I'd advise you to stay on your toes, though - don't care about it too much.