Getting on birth control

I’ve been wanting to get on birth control for a while but I’m somewhat afraid to do it for numerous reasons I’ve never wanted to ask anyone any questions about it cause I’m kind of embarrassed and when I’ve tried before I was like shamed out of it. I’m fully grown now but for whatever reason I’m still ashamed 🤦🏽‍♀️ (yes I know that sounds very childish but I can’t help it) but what I wanna know is do I have to tell my doctor every single guy I’ve been with and when? Like what is the full process start to finish for getting birth control the first time?