Yes you should be concerned. I was like that at your age, and it turned out quite bad. The "leave me alone" solution feels good but doesn't last a lifetime, and when you find your Self being not so pelasant (like anybody else, even your Self grows boring), it will be trouble.

I fooled myself thinking I was deciding to be alone, while there was no decision, I were unable to socialize. Later depression smoked me out, and it was not funny.

My advice is to pick carefully company. Not your familiy for sure! If you have interests (your surely have) look around carefully for other people to share with. Plan carefully, don't get caught in... how to say... oversocializing situations. But get out somewhat. Find a balance, in medio stat virtus.

My advice. Good luck