Firstly

on your loss! 90lbs is lost is amazing!
Secondly a big hug to you

for the way your family is treating you. Sometimes people get jealous because you have accomplished something you set out to do even whether they are overweight or not. Also they may have previously percieved you in a certain way and now are not sure how to deal with the new you. Losing weight and getting in shape usually gives people more confidence and makes them more out going so it does change your personality a bit. Maybe with some time they will get used to it.
You are not the only person that goes through that type of thng either, some people have lost friendships and sometimes boyfriends and spouses because they could not deal with that person's lifestyle changes.
Stay with your plan, keep exercising and don't look back. I am also 5'8 and my goal is to weigh 150lbs. At out height you can stay between 150 and 145 and still have a good BMI
Check out the Sugar Busters forum on this site - they may be able to give you some good advice on maintaining on the SB program and there is also a maintainers forum here that might be helpful to you as well
