Bc problem !?

So I am 18 and I been on the shot for about 6/7 months and at first I liked it but I feel like it has takeing to much control over my hormones with is what it supose to do and I gained some weight I am frustrated with the fact that I don't know my body anymore i don't know when o have my periods I don't know the reason for anything that's going on in my body /: I just wanna have a normal body and be able to keep track of what is going on in my body . But my boyfriend is 17 and I think it would be the best choice to stay on it but then again I want my old body back cus I lost 30lbs Idk what to do someone's opinion on this ??