Whats a personal reason for not wanting vaccines to be compulsory?

i know it should be like, 'i had a family member who died because of vaccines' etc but i don't think i do have family who have been effected by vaccines, so what would be a reason coming from a personal view? if i was saying vaccines should be compulsory then i could say something like "although i have no proof that i have been protected by disease because of these vaccines in future they could help prevent a deadly disease from..." etc but because i am doing that they should NOT by compulsory i don't know what to write for the paragraph that is from a personal view. any ideas would help heaps!