What Type Of Visa Do I Need

The only visa that would allow you to move to the UK and live with someone is a marriage visa, and you can get details of this from the UK Border Agency.

Again you ask about a visa to go to England and live with a man.
Is this the man you have met over internet?
You have already been warned not to be involved with someone you have met over internet. Still you continue to try to go to England to be with him.
Wake up and before it is too late.
You are under 18, so you cannot just leave and go somewhere else to live.
You have to finish school and get an education.
You are obsessed with the idea to go to England and this man.
Stop having contact with him - it might be very dangerous what you are getting invovled in at the moment.
He might have promised you a wonderful future - it wont happen.

Last time it was about a visa to USA and getting adopted there by a 36 year old man.
You really are desperate to destroy your future. Work it out in your own family and own country first and get mature and grown up.

Both the UK and USA (and all western countried) have skilled and very wary border police and this character does not sound like the sharpest tool in the box.