Im becoming more and more antisocial?

I used to be so talkative and bubbly and loud and laugh like no other. I was always that kid laughing and making noise. I used to have so many friends i never had time too talk to them. And then came highschool, I'm going onto my sophmore year and the ones i used to tlk and txt everyday I now text once a month. The guys houses i used to go to every weekend i havn't stepped foot in since last summer. I used to be so happy, loud, smiling, laughing, and having a good time. I used to be so into and caring for my girflriend and now its getting harder and harder and I hav to basically force myself to see her. I want to be the old me. I loved the old me but now I just have like 6 good guy friends and well still alot of friends that are girls and they love me, but we just never talk anymore. Its just since we dont go to school its almost like a chore to keep in touch. What wrong with me?! My phone always used to be ringing and vibrating. And now it never does. Its like technology has made me antisocial.