Help

I have never been diagnosed but I think that I have depression. I have been suffering for nearly 2 years now and I cannot go on like this. It all started from when I did really bad in my A level exams. I had been top of the class all my life and this was such a huge shock and it really got me down. I have also failed my driving test 7 times and am surrounded by people who are telling me that I'm worthless and will never pass. I panic about the smallest things and I cry at least 4 times a day. I was also assaulted from the age of 10 by a member of my family and I think that it had left deep mental scars which has left me feeling like I'm one huge mistake. I have started to feel physical pain from this now and it stops me from socialising and leaving the house. I do not know what to do but all I want is to get better for my boyfriend as he is the only person that I have got. Every time I speak I feel like I'm stupid and feel like I should just be silent and not have an opinion. My friends don't want to know me and my parents don't exist to me for other reasons. I just need some advice on what I should do.