My brother hit me and now wont admit to it!?

im 20 years old and my older brother is 22 we are both still living at home. we got in this huge argument one afternoon in the garage because of the landrey something soooo stupid. anyways he called me a ***** and pretended hee was gonna hit me i got pisssed of and starting cussing at him and went inside.. when i was coming back into the garage to get my clothes he slammed the door in my face! i opened it and was like whats ur ****** problem, as he was walking outside the garage he was like i wish i could kill u! i was like really i wish u werent my ****** brother i was screaming it to him then he got in my face and slapped me! i was soo shocked because i have never beeen hit before and for it to be by my own brother made it that much worse i started to cry, he didnt give a **** and left. i told my parents and i dont know if they even believe me because he's telling them that he did nothing to me. i dont know whats worse the fact that he slapped me or the face that he cant man up and admit it!! im soooo angry hurt what do i do???