i was rated a 3/10 (f)

i was rated a 3/10 by a male acquaintance today. for reference i am five foot four and 155 lbs. i wear aa cup bra. he pointed out my lack of a waist/big stomach, my flat chest, and my flat butt. about a year ago i was 125lbs, but my medication cause weight gain. i have been struggling with my body image my whole life, and this destroyed me.

what’s the best way to go about losing this weight and workouts to build my glutes. i don’t know much about working out or what workouts target what. i just need some advice. i want to do this healthy.