That girl who has ‘lots’ of friends

I was bullied since 3rd grade and when I tried to tell someone they never believed me because they that I was lying,because I go to a Catholic school and the teachers never listened and my parents and grandparents never believed me either because they thought I had all the friends in the world. And when I tried talking to my friends they never got what I was trying to say and I tried to end it all but it fails and now I’m scared I’ll get back into the habit of hurting myself…I just need someone who is older then me or as the same age to tell and help me to make the bullying stop.