Donate your old furniture if it is really not in that bad a condition to a home less shelter or a battered women's home or similar so you are doing good at the same time. You call them and many will come pick up.

Yes, just try to explain why you need new furniture. Give them some solid reason so that they could understand you and your room's requirements.

Try giving it to a relative to hold on to

My parents don't mind me spending money as a 13yr. old girl, but they're worried where to put my old furniture (especially my queen sized mattress) when I move in my new furniture. They say we don't have enough space to store my old furniture and that I should be grateful for what I have and that I shouldn't just be thinking about my self. They said I should just buy a laptop because I don't "need" new furniture. But my room is extremely tiny, I have a queen sized bed which takes up 85% of my room, the headboard is so ugly and outdated with it's metal gold swirls, my bookcase is falling apart and also very outdated, plus I have no where to put my makeup and beauty things. The only thing I like is my desk because it's modern. I want to buy modern furniture. My room dimensions are about 8'2" by 10'2". I calculated everything to the last penny (the cost of the furniture) and I measured everything to make sure the furniture would fit. I know exactly where I want my new furniture. I'm a straight A student, I'm good at assembling furniture, I do the dishes everyday, and I really want new furniture. HELP!!!