Did I make a huge mistake by doing this?

well, i have a minor case of a skin discoloration all over my body. my under-arms, legs, hands, face and basically everywhere. i have white patches. not pale white, but a much lighter color than my natural skin color. well, before i had jus small spots, but after i joined the swim team at my high school, i started noticin that my patches have gotten really worse. my whole stomache is like completely discolored. its gross. my neck, face and everywhere else is also startin to change. should i get off or what?? im not sure if i do infact have VITILIGO, but i do have the symptoms. on my neck is a pale white shade and also my chest and everywhere else. i dont wanna quit, but if its hurtin my skin, should i?? should i wear sunblock from now on??