I was depressed for most of my teenage life, to the point of a suicide attempt, and only recently (the start of this year) have I got past it. I won't pretend like I fully understand what you are going through because I do not, but I would like to offer some advice that helped me get through this.
I used to self harm often, and I thought that the best way to end my life would be through bleeding out, and this is what I attempted. That evening I did it and fading out my eyes closed. I saw nothing, nothing except darkness. Then I realized that, even though I had many problems, I could still control the choices in my life - instead of what experiencing what I felt then - nothing, I could not make any choices, I couldn't achieve my dreams. We all have the power to make decisions and go places in life, even if we feel like we are getting beaten at every corner. We are alive.
I decided then that I was going to fight my depression, and that's got my to where I am today. I am better. I understand what you are saying with the anxiety, but visiting a doctor may really help you. They will not judge your or anything like that, I'm sure that they see depression cases all the time. I cannot express how much it helped me to talk to someone, it may help you too.
On the topic of the exam results, I got my results today. They were not what I was hoping for. Will that stop me? No. There are always other choices and paths to take, and I now find it exciting as to what will happen next.
I would also be really happy if you watched/read a few of these, they also helped me a lot:
https://www.reddit.com/r/todayilearned/comments/2y0vhi/til_people_who_survived_suicide_attempts_by/
Check out some of the resources on /r/depression.
Lastly, if you want to talk more you can add my steam bagleman274 (are you a gamer?) or my kik bailey.davies9 or just pm if you would prefer.
Keep Safe - Bailey