Why dont girls like fat guys?

i just wanted your opinion. one day my friend and i (both 14 years old) went to a mall to use pick up lines to get chicks. I am not going to ly i am very very fat i am around 250 pounds and only 5'6, but i have great charm and a good sence of humor. and my friend has no sense of humor but he is tall muscular and has a six pack my complete opposite. at the end of the day my charm got me no where the same responses everytime, " fat kid" and walked away. when my friend tried he got success and made out with a few girls. the next day we went to the beach and we both were shirt less so everybody got to see his six pack and everybody saw my fat. he tried his pick up lines and made out with everyone in sight. the closest thing i got to success was when i came up to a group of college girls and when i said what i said one of them responded, "how cute hes like the pillsbarry dough boy," one of them pinched my chubby cheek another grabbed on to one of mt many fat roles and the other was rubbing my tumming because she wanted to see it jiggle. I have a high self asteem so dont worrie about it but why did the girls like the hot non personality guy and every one laughed at the fat ball of energy guy. i like chubby girls why is it not vise versa.