Am i medium or thick?

Hi im 15 yrs old .. I dnt think im fat . Im built like my mom ( curves, big boobs, think thighs, a butt) only problem is i dont gave a really huge butt.. I think i have a little but not big but i am definetely curvy and have big boobs.. I have a pretty face what alotta people tell me , im asian so i think i have a pretty good shape bcuz there preferred to be more small and thin with no body, so am i considered medium or thick? My cousin tells me im thick all the time but yah, i wear size medium in shirts and a size 27 in pants.