Depression, insomnia, anxiety, somone please help me

This is going to be a long story. Im 15 years old and i have a few months of school left before i leave and go to college. Im known in my year group at school, a lot of people say hi to me in the corridors and im welcome to talk to most groups at lunch or break. I get invited to the occasional party and most people seem to get on with me well in a party atmosphere. However my own problems began to rise 2 years ago where i spent almost my entire 6 week summer holiday at home as i hurt my leg and couldn't go skateboarding. I noticed at the end of the holiday that not 1 person had asked me to go out and meet them, i realized i had no social group and i began to realize my lack of social skills from there on. Even though my school prom would be almost 2 years later, I became very worried that i would have no mates to go to my school prom with, that i would be the loner. I began searching endlessly on the internet on how to develop social skills, strike up interesting conversation topics etc, i started making word documents of useful website addresses. I began to over think about socializing, which made me realize how bad i am at socializing compared to other people, this eventually lead me to my first bout of depression a few months ago, it only lasted 3 days but it was the worst thing i had ever experienced, it came back a few days ago and i feel horrible, i dont care about anything, the world seems such a boring place. Im fine having a conversation with 3 or more people because it takes the pressure off of me, i can then elaborate on what the other person has said, but i get very anxious when i have to have a 1 on 1 conversation with people because i just never know what to talk about. I have had insomnia for at least 3 weeks now. I just want to know how to make it stop. Before my depression i used to think very constructively about the future, there are days when i sit in my kitchen and look at the garden and see the sun and i think to myself 'the world is such a wonderful place,i love it!' , other times i just feel like everyone is boring. Ive been trying to turn my life around, recently i have been silencing my negative thoughts as much as i can, i have stopped listening to heavy metal because of its sad lyrics and violent musicianship. I am trying to be a better person and appreciate things more and be more happy but depression and anxiety is stopping this from happening. Could somebody please help me with my problems?:(

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