Is this a sin?

I'm 14, my family makes a good amount of money.
I always ask to buy things like a game or things that I usually want for fun, such as a
small microscope for when I get curious or other things.

For the past week I've been into Photography and I've loved it, and I want a good beginners
budget camera for photography but I don't want to ask my parents because I feel selfish and wasting their money over my enjoyment.

Is this a sin, that I've been committing and is there any way I can stop myself?