Am I too big?

Hi! I'm 14 and have a condition called CFS/ME. Before I got the condition i was I tiny bit overweight but since I can't do exercise anymore I feel really self conscious about my body. Everyone at school makes fun of me calling me 'fat', 'ugly or staying stuff like 'go kill yourself because you're no use to anyone'. All of my 'friends' who I thought were friends just suddenly making fun of me because of my illness and trying to make my life harder physically by tripping me up and barring my way. I can't fight against them because I'm too weak. I told my mum I want homeschooled instead of being with a bunch of losers at school who don't understand the meaning of equality and kindness.  I just want someone to understand. Am I fat or am I just going loopy?