i am on a J1 visa at the moment i want to marry my boyfriend i was not planning on meeting a guy but now that i have he is my everything and i dont want to go back home will marrying him get me my citizenship
You may enter in a BONA FIDE marriage (meaning not for the sole purposes of skirting the immigration law, but a genuine authentic marriage) and AOS in the United States, provided you meet all the statutory requirements like J-1 Two Year Waiver, absence of criminal history etc.
Speak with an immigration counsel in person before your next move.
As people noted you have to be careful the 2 year foreign residency requirement (see if the visa in your passport says you are or are not subject to 212(e). You may also have an issue if he ships out overseas. They have ways of dealing with that as well but you should use the assistance of an attorney of that is a possibility or if you're subject to 212(e).