i wish I have the power to rewind the past

Long time ago when I was only teenager I was so eager to gain weight. I ate everything that mom feeds me, but still never gained weight I guess my metabolism was very slow. Though not anymore and I wish I can rewind the past. But if I will given a chance to go back to the past, I will definitely not to wish to gain weight because its so freaking hard to lose weight. Well, finding fat burning supplements that work is easy, but finding ones that do the job without annoying side effects is the challenge. It could also cause a big whole to your pocket. Huh! with the holidays coming I am aware that I'll be gaining few more pounds Lol! So I really need some good plans and motivation here