I don’t think your problem is having no identity. You don’t games anymore. That’s a good sign you have your own likes and dislikes. It may not be as developed as you want it to be but it’s there. Go out there, discover your identity and build it.

I think your problem is lacking assertiveness and confidence. You may need some assertiveness training. You’re afraid that you will upset them if you tell them to stop buying things for you that you don’t want. If you’re looking for advise on how to tell your parents just think, what’s the worst that could happen?

Also, you need to start somewhere. Yes you’ll be stirring the pot so to speak but they won’t disown you for it. They’ll notice that you’re not being what they’re used to but they’ll get used to it. You’re not doing anything bad. You could phrase it in a way that still appeals to their sense of parenting like “i don’t want any more ages, but could you get me a (something you want), I would really like to have one”.