The problem with your parents acting this way is that they don't realize that by holding you back, which is what they're doing, you might start doubting yourself and become afraid to take risks...not just moving out, but going after a new job you want, etc. Most of my friends' parents expected them to move out after college, or at the very least, establish themselves as independent before they hit 30.
My parents, especially my mom, were kind of anxious about seeing me move out, but they've been very supportive and I don't know what I would have done without them. I understand it might be hard for them to let go, but really, your parents seem to have crossed the line between normal-ness and, well, controlling. Unfortunately, I have no idea what to tell you...but I think the advice others has given has been on the mark.