I have issues...can't figure them out..?

Question

I have existential depressions all the time, I was a bit "OCD" as kid, I have many symptoms of ADHD, my mind is cluttered with thoughts, I feel lonely because no one understands me, my IQ is 150 and people sometimes treat me like an idiot which frustrates me. I am a 14 year old girl and I have 5 friends of which only one is a real friend. I just don't know what to do with myself, I can't stop thinking/asking " Why did God create us, me and the humanity? What's the purpose of life? How can someone be satisfied with just having a family without doing something more in life?"

Update:

And sometimes I just get angry with no apparent reason...

Derpina · Accepted Answer

This is actually one time I can say: " I know how you feel".
You literally just desribed my life - except the fact that I´m 3 years older.
I also used to be rather compulsive in certain things as a kid, then it passed, I got a lot smarter within two years, but then actually started having depressions, realized life is meaningless if I waste it on routine way of living. 
What I have is ´people I know´ and my 2 good friends, because to me people are shallow and I´m an introvert living in an extroverted world.
You should start digging into stuff that interests you, e.g. philosophy and esoterics. I know about esoterics plenty of things myself and it reveales a lot about life and has answers for your questions. Esotericism covers a LOT of stuff, so don´t give up like most of the people who just start by reading something that seems boring to them and they give up on it.
I get angry a lot too, but I usually tell myself that´s because I´m a sagittarius and people tick me off all the time, big time.

I have issues...can't figure them out..?

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