Need help. Is 18 to early to get a breast reduction?

Not Necessarily. Breast reduction surgery performed for the appropriate candidate tends to be one of the most patient pleasing operations performed, regardless of age .In my practice, timing of breast reduction surgery is determined on a case-by-case basis. It is certainly not too early to learn as much as possible  about the procedure and the potential risks and complications associated with  the procedure.
No . If your breast size is already disproportionately large, or you have stopped developing, then it is reasonable to have the reduction surgery at this age.
No. If your breasts are out of proportion to you body size many times a breast reduction can help no only with your body mechanics, but also your self esteem.