weight help!!

last summer, i was 150 pounds. i was never small, but i loved my body. i then got on the depo in october. i gained a bunch of weight(20+ pounds) and so i switched off of it in june, to the mirena iud. when i got the mirena i weighed 175-180. i just weighed myself and i’m now 200 pounds. i don’t mind being bigger, but i’m starting to not love my body anymore, and would love to be back to 150. anyways, i don’t know why i’m gaining so much weight, and it doesn’t help that my mom makes a point to bring it up. i’m going to start eating healthy and try to exercise as much as i can, but it’s hard when i have school and then work after school every night. is there any tips out there that you ladies have that could help me lose some weight? i would really appreciate them!