I feel humiluated becuase the only things i can really fit into are for little kids like 7 year olds? im 14?

im a14 year old boy, but im only 4'4, so, its hard to find a lot of "cool clothes" in my size, so i have to wear a lot of cartoon clothes, but im scared incase like other people laugh at me becuase at 14, you dont really watch cartoons? is it childish for me to still be wearing a bart simpson t shirt? i also have spongebob squarepants boxer shorts which kinda embaress me too becuase there for 7 - 8 year olds?