Sai Ram. Pl. discuss and convince them. You are technically / legally a major and are free to live any where but unless financial independence is there, what will you do? They can't force you to marry against your wish at the same time.
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Before taking any drastic step, think about the future. If you leave your house, where will you go ? If you have an affair and the boy friend is ready to mary, then it is ok. But if this is not the case, you should accept what your parents say, as they love you, and never think of ruining your life. They must have found a suitable match for you and you can persue your studies even after the marriage.