Remember the decision you made to be the way you are now? Probably not. It is true that you are what you have always intended yourself to be. No matter what your age, gender, religion, sexuality any outside force that "shapes" your life the most important thing, the most powerful influence in your existance is the power of your decisions. Ultimately and always your life is YOUR life.
How long do you get? 70 good years, and that's pushing it! Then what? Heaven? Hell? Who decides? Who cares? Screw it, have some fun. Be good to the people around you, they're fucked too. Or. be an asshole, it's your life, who am I to tell you what to do. Are you afraid of consequences, the government, what other people think, god? Get over yourself, you're not that freakin' important.