Dating should be truth in advertising. Don't pretend to be one thing to snag a mate and then climb out of the sheep's clothing after inking the deal. That is one reason so many marriages fail.
Be yourself in dating. If you don't think enough of the true you to have faith in landing a life partner, then why should anyone want the true you after you pull the post-marriage "reveal".
Perhaps you have faults you believe a mate will find off-putting. Instead of tricking the mate into thinking the fault isn't there, work on fixing the fault.