I have an interest but no idea where to start

I used to be terrified of bikes but since finding out I have a large tumor in my abdomen, and now going through a separation, I have been wanting to step out of my comfort zone. I rodeo and ride horses (27F) and have done that since childhood but I am too scared to even ride a dirtbike. I want to overcome this and get a street bike but I don’t know where to start.

Any advice is welcomed 🥰