How do i get put on anti depressants?

I suffer from extremely low self confidence due to bullying from year 7 through to year 9. At one point it got so bad i attempted suicide (aged 11. i watched my mum deteriorate mentally and attempt suicide many times and she jumped in front Of a train last year and died. there are other things too which i cannot mention which i feel have screwed up my life. i have rang child line, spoken to their councillors, i go to a school councillor. I have no problem talking to people, it's just i don't feel it helps. I hate this feeling of depression, i have lost my appetite completely. I want to feel motivated and comfortable in myself. I feel anti depressants are my only option. If i were to go to my GP soon, what would i have to do to get put on anti depressants? I really need them, just to get me through the next two years as i am doing exams, i just need a little more help getting motivated. After my exams i will ween myself off them, but i really just need a pick up. What will i have to say to my doctor and how long will it take? Thanks x