Depressed😕

I've always been a very motivated, happy person, but lately I've not been myself. We moved close to a year ago, in the middle of my junior year of high school. I guess I've just had a hard time adjusting. I'm a straight A student with almost a perfect 4.0 gpa... But lately I don't care about school. I just want to be done with it. I also have been very conservative with guys. I wanted to make sure they were right before I rushed into serious things. I've noticed a drastic change in that part of my life too.  It seems that the guys that go after me are only there for sex, and part of me is starting give in to it. I know this behavior is far from myself and I feel guilty about giving in to them. I don't know why I have turned to this. I feel disconnected from my old friends and not close enough to my new ones so talking to them hasn't helped. Does anyone have advice? I miss being the outgoing, happy, independent person I used to be.Â