If Mom and Dad saw me having $1000 in checking

And how are they going to find out?

they INSIST I take them to dinner everynight, buy this that at Home Depot, Walmart, JoAnns, Michael's stores, Fry's food, Safeway. The money would be gone real fast. The answer to that is NO WAY AM I GOING TO DO THAT AGAIN.

Tell them NO. You could also respond to every request/demand with "No, thank you." And don't explain or justify your answer. Just keep repeating "No" or "No,thank you." until they leave you alone.