You are doing this young, it will work out. I have seen pictures of you, you look pretty good. This is not easy, but it is possible.
As far as GRS, not as necessary for life as you may think. It is the icing on the cake, if you think of it that way, you will be better off.
You are taking a scary step, but it is necessary. Its never super smooth to start, just don't get discouraged.
You will realize one day, life is better and will move into a comfort zone.