how did your ocd start?

hey i‘m think some behaviours i have are alarming but i‘m not sure if i should talk to a therapist. did your ocd just popped up and you suddenly had the mental illness or was it more like a process and it started slowly?

English is not my first language pls be kind

edit: Thank you so much for sharing your story’s, you helped me a lot! I‘m looking for a therapist now