bets way to lose weight <3

hi i’m 15. i’m not overweight, but i’m defiantly not underweigh. maybe a little on the fat spectrum but barely. anyways 5e guy i like is underweight and i rlly wanna get with him, but i feel like the girl in the realtthionship should be smaller. so know i’ve restricted my diet and started exercising. can anyone help me find the best exercises please. (btw pls don’t say, domtchange for him ect. becasue i resllywant to get healthy anyways :) and is there a possible way to get shorter? i’ve always been insecure about my height. i’m tall and i hate it, i feel uncomfortable. any exercises that make u shorter lol? thanks so much if u reply, it means the world to me xx <3