I was put on birth control 3/4years ago, it was the shot and i didnt have my period, now i do but i stopped in may but it's different what do i do?

Be patient: I believe you are saying you were on DepoProvera and had your last shot in May. While on the medication you didn't have a period, it can take much longer than 3 months for the medication to clear from your system and for you to establish a normal cycle again. Also your periods may not now be the same as they were 3 or 4 years ago, at least right away, and this is perfectly normal.