I've Always Leaned On The Side Of Being An Extrovert.

I've always leaned on the side of being an extrovert. But nowadays I'm finding myself developing social anxiety, and the intervals of this not happening are becoming shorter from time to time. Can it be because of me not going to school since about a year due to homeschooling (I've always met and made new friends 'only' at school, cause I'm not allowed to visit houses). So basically can my lack of friends interaction be a reason to this newly developed disorder? I'm about to turn 16 next month (if the info helps). I've no stress of education or so because I already get good grades and love what I'm studying. My parents aren't strict nor have they put any kind of pressure on me. I don't have depression and have never passed through any malencholic situation (by the grace of God. So why am I feeling this way?