I want to lose 100 lbs so that nobody sees me as a big guy anymore?

I think its fine that you want to lose some weight, but to lose 100 lbs. is a lot. Especially since you're 6'3". I mean I'm an 18 year old girl 5'7" and around 140. Im not fat and im not super skinny, Im average weight for my height. Maybe set a lower weight loss goal. Start out at like 30 lbs. and go from there.