Do not try to bluff your way through a relationship because at sometime the whole thing might come out and as we all know, one lie leads to another and then before you know it the whole relationship will crash. Be as honest and as frank as you can, taking care to conceal your identity.
Some one once said that a friend is some one who knows all about you and loves you just the same. So there is no need to hide things about you. Of course you do not have to tell the person every ghastly, gory detail about yourself, but at the same time you do not have to conjure up stuff about you that just is not true.
If at all you do paint a very rosy picture about yourself, including things that just are not true, or are far-fetched exaggerations, and the other person does flip for you, in reality you will be basking in another persons glory. This picture you have painted is just not you.