Feeling embarrassed

Hey guys so I’m 17 and weigh 217lbs and I want to change my habits to become healthier. My mom is always at the gym and dieting but even though I know she’s looking out for me, when she mentions me going to exercise with her I feel embarrassed. I feel like if I start going out of no where, she’ll make a big deal about it and make me feel like a freak. The gym is not something I’m new to I used to work out at UFC gym consistently but I stopped going due to money reasons. I just need the motivation to get back into fitness.