I feel like the desire to end virginity is not a good reason for marriage! Alas, you seem to be rather permanently disabled from solving this problem all the normal ways. I assume your parents cannot be persuaded to give you a time-out; it would undermine the entire purpose of keeping you belted to begin with.
As always, I am torn between my honest self and my catholic upbringing, because there is a part of me that thinks it is a good thing that you stay locked until committed to marriage, but the free spirit in me regrets that you are denied certain natural pleasures!