Sexually activity - Burning Sensation

I am 18 years old and just became sexually active. When i Pee however, only a small amount comes out and starts that burning sensation all over again dont know what this could be and i dont have any health issues or money to go see a doctor.

You should find a sexual health clinic close to you. It sounds like you may have an STD. Even if you don't have money to go to the doctor, you must find some somehow. Ask your parent/guardian or some friends. An untreated STD can cause infertility and other serious problems that can hurt even worse (pelvis inflammatory disease). Better to get checked out before it gets too bad because when it gets that bad you will have to spend WAY more money. However it may just be a bladder infection and have nothing to do with sex. You may need medication if it is severe. Try drinking Cranberry juice. not from concentrate and not cocktail. It can help. Best of luck!

Sometime its due to body heat or blader infection. But seeking doctor is always a good decision if its related to sexual organ,