Welcome to the forum. You're not the youngest. We have a couple younger than you.
Like the man said, don't ride that bike without brakes. It sounds as if you need to concentrate a little more on the bike instead of how the engine runs. Spend some time/money and get some brakes then go through the wheel bearings and steering gear to make sure your bike is safe then we'll try to help you with the power problems.
You're young and a new member. We don't want you to get hurt.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"