I dont kow what to do. I cry and cry and dont know what to do about him. I thought he liked me.?

I was pretty sure that he liked me and so I had a ten year old (by the way I am fourteen and so is my crush) ask my crush if he liked me, and he said no and that he doesn't want to date anyone right now ( Let me tell you something he asked out my seventeen year old sister the week before and was staring at her and her friends s before I asked him and the next day he asked out a sixteen year old girl but she said no. Well we were at this awards thing and when I went on stage I had the reddest saddest looking face i ever had in my life from crying so hard from him telling me no. Everyone thought I had something wrong with me. So my friend is going to tell him I meant that I just wanted to be friends. I think it's cause I 'm a little overweight. Like 20-40 lbs. So I dont know what to do I really really unbelevably like him and wish I knew how he really felt, I'm so confused.