I am 13 and 5"4" and I though I was fat and I tought i weighed 107?

I thoughtvi was107 pounds and I thought I was fat so I stoped eating for like 3days I started eating again yesterday but I weighed my self last night and weighed 99pounds and today I weigh 94pounds what i i going on I am eating I am scared to weigh myself cause I fell like I lost mor what should I do please do not be mean ty?!?!?