I am fourteen years old, and I think I am suffering from Anxiety.

My symptoms:
-I worry a lot.
-I worry about what people think ALL THE TIME
-I dont like socializing much because im scared of being shut down.. idk
-I cant get to sleep as I worry heaps.
-I get nervous a lot
-I have little mini heart attacks
-I think a lot of what could happen

Some say this is depression but its not! I am happy with life :-) .
Please help me though.