How can I go from feeling OK with my life and feeling happy to feeling like I have no life to live or not worth living it?

I been dishonest to the people i love. I've hidden from the world and everyone in it. I've pretended for sooo long to be somebody I'm not and now I hate the person I am.

I have no idea what to do. how to overcome this. Its been with me for so long but is just now hitting me like 50 tons of bricks.