Piano as well. I don't write my own music, but love to play with the old ones like playing really fast or slow or loud or .... sadly I am not of good in improvising on the piano but with singing its fine.
Seriously though I've never been good at anything artistic. I'm a programmer by trade and occasional dabble in the odd personal project lately, and I have a lot of hobbies. I experiment with electronics, I'm an (really really) amateur blacksmith. I feel like those engage the parts of my brain art might, but I don't feel like they're any sort of self expression. They're more academic pursuits, I do them to learn and learning itself is kinda the end goal.
To be honest I'm not sure I know what "expressing myself" in an artistic sense would be. I use words to convey my thoughts and emotions but I'm certainly no writer.
Thats all good! You don't need to write like Nabakov to enjoy expressimg yourself, any medium in whatever skill level you can that scratches the creative itch is a good medium.
Oooooh you're gonna get flack for that. I think that can still be used to get your creative juices flowing or atleast bring the image in your head to a first draft.
I love painting miniatures. I like to find or create a vibe in the sculpt and follow that to the best of my abilities. I'm a software developer so I already expend a lot of creativity in at work but there's a degree of freedom in it that I miss otherwise. I just like making stuff.
Video game assets/customizing :) I used VRChat as an excuse to design a persona (in my pfp) and I made a game prototype to pay homage to my first car. I wanna do way more stuff but I'm still learning
I write and record/program music, often by myself but sometimes with others. I never release any of it though. Last release I did was in 2014 but it wasn't my music. I was just the drummer for my friend who doesn't play drums.
Cooking. It gives me a chance to be creative, plus I need to do it multiple times a day. Also, you get to share the fruits of your labor with friends/ family. Definitely helps that I don't have any friends who are picky eaters.