feeling jealous and envious.. gone suicidal

I made quite alot of search on the internet and I came to know that I am facing social anxiety disorder…

Yes, I do have fear of people in public and groups.. even with some friends.. I am quite all the time while they are doing their own shughals..

My hearts starts pounding, butterflies fly abrutbly in the stomach whenever I am called on rostem in class or in case of public speaking..

I liked a girl alot in the university.. she is 1 year senior… I havent approached her but she knows that I flirt with her sometimes… when I am passing near her or even just see her.. my heart starts pounding.. my body start sweating and butterflies in stomach(nervousness)…

That is the problem I am facing… social anxiety..

I want to talk, communicate with people like a normal human being…
But the words wont come out!