I have a job?

i am 15 i work at dominoes its a pizza place and i buy my own things and my mom and dad take my things away from me and when i am not working i am in my room playing on my Xbox yesterday i bought a lp and they took it away from me so they can keep it what do i do?

They do not think that all of the things that you choose to buy at yr age are good for you. It is hard on you - but it is a ton of bricks to be a parent. Ask their opinion on things when you can. Explain why you feel as you do.
Open up a dialog with your parents. It is hard, but when you get married it will be much negotiation. Negotiation or arguments and hurt feeling is the choice. When you have kids, it will be more negotiation but you will be the decider, and see how they look at you, because you love them and don't want them to get hurt!

obviously there is a big problem, You didn't mention why your parents are doing that. It has to have a reason. the best thing to fix a problem is communication. Take time to talk to them, explain your ideas and listen to them too, Try to balance the situation. good luck.

Having a P/T job is good for you to learn about life and the many types of people there are in the world. However, if you spend the rest of the time on your Xbox, your not showing your parents you are becoming mature. Are you saving for a car, college, or for emergencies? Are you applying yourself to the best of your ability in schoo? Do you do chores around the house without being asked or told to do them?
If you can honestly say yes to the above questions, there is no reason for your parents to have taken the lp from you.
If you can't, then...

I find this very suspicious.

I think perhaps there is more that you are not telling on here.

Are they taking these things away as a punishment for something?

Perhaps you are buying these things without their permission and they think you should be saving for your college fund.

I can't believe the would just take away things for no reason.

I also find it suspicious that you misspelled the name of the place that you say you work at (Domino's Pizza)

I believe you need to sit down with your parents, regardless of whether you are able to spell or not. I believe you need to voice your concerns, and listen to theirs.
Since I am not one of your parents, I will not give you a parenting answer. But I can tell you what the psychologists say. At your young age, you are working and buying some goodies. But those goodies are not what life is all about.
Your parents are not going out of their way to punish you. But they are trying to show you the value of life and goodies are never balanced. Your parents are using tough love to show you the goodies are not supporting yourself; it is merely a way to amuse yourself. They are the ones supporting you with money and love.