Sadly

All of my friends know me as bubbly and cheerful but I'm not ok. Nobody ever asks if I'm okay, but I'm always helping everyone else. I tried talking to my mom and i couldn't get it out so i started crying... She mocked me instead of asking what's wrong. I've been feeling super self conscious about my weight even though I'm underweight... So i wore a high raise bathing suit out to my pool... My step dad told me it made me look fat and pale. My brother constantly reminds me that I'm disgusting. I go home so i can try to find a safe place... But being their makes things worse. Obviously i always try to go to my friends (I'm 16) and my mom gives me a hard time for it. I don't know what to do anymore I'm so trapped and I just need help...please.