Why am I like this.

The last 4-5 months I haven't seen or barley talked to any of my friends (i dont go to school so the only time i would see them is if we had planned something.), whenever I go out in public I feel like I'm gonna have a heart attack cause I'm so anxious and Idk why, so for this reason I've barley left the house in 4 months. My whole life I've never had a problem with anxiety and just lately I have no motivation to go out what so ever.i hate the way I feel because it's getting in the way of me being able to get a job, see my friends etc.