Not a decision you should jump to. You are very young and have plenty of time to think about what is best for you. Maybe even lose some weight and see whether you really can't stand the way you look and feel, in this case you will know your answer.
What you shouldn't do is gain weight and then regret it. Gaining weight is something you should feel 100% is what you really want and waiting a little longer may make you realise this is exactly what you want. As a result you will enjoy the process all the more.
10 years
