I have to decide between my friends

itsme - Oh my goodness, this sounds heart wrenching. I read your post and appreciate how well you identify your feelings. I don't know how old your are, but I give you credit for narrowing down your disposition.
Everyone goes through grief in different ways. When I was in the 4th grade my mother got remarried. We moved and I, then, had to go to a new school. I neve thought about previous friends, but I thought a lot about our old house. I dreamed of growing up, buying our old house and living in it again as ALL MINE. When I got old enough to drive I drove out to our old house to look at it and reminisce. Once I stopped in and asked for a tour. Believe it or not, the new owners invited me in and showed me every room. I learned that the house was not the same. I've driven by it a few times since then, and it's a dump. I would never want to live there.

What I find remarkable about your post is your insight, knowing that a new transition may be just as stressful as the previous one. But consider this: You can talk to yor parents. You knew your previous friends longer than the new ones. Your parents were concerned about other students who committed suicied. Thank goodness you have caring parents!!!!!! - And that is not a joke!!!!!!
So talk to your parents about those suicide incidences. What information is known about those sad individuals who took their life? Was your previous school in a bad neighborhood, bad influences, high drug rate? And, were your previous friends up and up type of people? Or were they 'in the hood' down troding kind of loosers with no future who may influence you to do the same?
You seem very empathic and caring. But look at the larger picture of your life. Write your feelings in a journal. Read some books on grief, moving stressors, and how to build new relationships.
I think you will do well with your decision.