The first priority is to wait till you are at least 18 years of age before considering any form of refractive surgery. Children (including teenagers) should generally avoid any refractive surgery as their eyes are probably yet to have matured and may still experience significant changes in refractive errors.
It would be imperative that your refractive error is no longer increasing to ensure that your post m-operative results remain stable.
In terms of your current level of myopia and astigmatism, I would only recommend implantable collamer lens (ICL) as a viable option, provided there is sufficient space within the eye to accommodate the ICL.
Lasers (e.g. PRK, LASIK and ReLEx SMILE) at these high levels may not provide sufficient long term stability and there may be a higher chance of certain complications such as dysphotopsia (haloes & glares) and corneal ectasia.
Dr David Chan