Major depression and panic attacks.

Hello doctor, I am an 18 year old girl suffering from depression and anxiety.I really want to get rid of this problem but I am not able to.I have been suffering from this problem since 7 years and couldn't get over it yet.I feel like giving up on life sometimes.I regret being a part of the society. I was a bit shy since my childhood and meeting new people was an issue for me and now it has become a major problem for me.I experience major panic attacks most of the times.It feels like there is something that's killing me from inside but can't figure out what's that. When I am alone I start overthinking and even if I am busy doing something,something goes on in my mind and I start thinking about that. Sometimes I start blaming myself for being like this and not getting any solution for this. I feel like I am not like this in real.It's just because of anxiety issue that has made me like this.I want to be what I am in real without being afraid of anything. Please help me in that.