<human>: Condense the text into a few key points

My girlfriend recently bought a keyboard so she could practice piano at home. She was playing most of the day with headphones attached and eventually went on her computer and started listening to music. An hour or so later, I asked if I could try playing and went over to stumble through some of her sheet music. She helped me figure out some of the parts, and then went back to her computer. 5 minutes into playing by myself she announced, "it's my turn to play." I protested that I had just started playing, but she said, "it's *my* keyboard."

After a short discussion, she revealed that she didn't want me to start playing piano, because it was *her* hobby. She brought up that I already have a bunch of hobbies that only I enjoy, so she wants something for herself. I've tried to get her interested in some of my hobbies in the past (chess, programming, baking), but she never got all that interested (no big deal, but I would love for her to share my passions). She said that we should find a new hobby we both could enjoy, but every time we try something different, I work really hard to improve and then she loses interest.

It seems like some of her hesitation about me learning piano stems from some combination of her insecurity and my hyper-competitive nature. She's been playing piano for a long time (and is quite talented), but self-admittedly, never really put in as much practice as she would like. I have an obsessive personality, and will spend all my free-time practicing and working on my new hobbies, and it seems as if she's afraid I'll make piano into a competition with her.

On the one hand, I can understand why she wouldn't want me to start playing piano if I drained the fun out of it for her, but that is certainly not my goal, and there is no way I would ever come close to competing with her abilities in the near future.

I'm not entirely sure what advice I'm looking for, but I would love to find something we both can do without making her lose interest. Help!
<bot>: my girlfriend doesn't want me to share** ***her*** **hobbies, but I can't seem to find something we both can enjoy.**