Support && guidance idk what I'm doing!

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when I was in high school I was a pt trainer for ROTC! I was hard core. I had the best platoon and I was very active in dance ... Until I switched schools got depressed got into fights , started doing drugs and got lazy. Drink and hard drugs was the only thing that mattered and I lost a lot of my years in and out of rehab. Then I went back into the program and hey got sober and even got pregnant. Gained ALOT OF WEIGHT , and still after four years have been struggling well not trying to get it off but I'm ready now. I wanna be more athletic with my daughter. I can't do it a lot support && help and suggestions would be amazing thank you !