Sell books

Hi I'm 15 and this year I have read 52 books .
And I want to sell them online one problem
I don't a credit card and I don't want to use my parents because they will stay with the money after all I was the one that bought them with my money
So is...

there any website that I can sell my book for a good proportion without them asking for credit car I'm fine with checks they send it to me I send the books no problem bt I don't know any weebsite like that

Im not sure about websites but you can go to hastings or half-price book stores and you can turn in used books for credit to get new books or probably anything they sell in their store.
Sorry but I dont know any websites that sell stuff without credit cards...