I want to end my life before its to late

Since I was diagnosed with a genetic condition I been looking pictures online of what the effect in the body would be 10 yeaes or 20 years from would be and it gives me the horrors,its scary and I want to prevent myself for ending like that,such genetic anomaly dont kill you just make life difficult than its supposed to be,I don't want to have my teeth degraded or my body being all abnormal, I express my concern to the doctor and he told me I was exaggerating which i dont think I am