How do i deal with this?!?!?!?!?

Theres this kid at my school in my grade (and unfortunately lives across the street from me too), who thinks he is the sh*t about everything. what makes this situation worse is that he has to one up me on everything. The other day I hit a triple with like one bounce to the fence in baseball game, and he randoml comes up when im talkng and goes " Big deal, i hit an inside the park off the fence" and if i bought some new phone that costs lke 200$, then hell come up and say he bought a niceer one for 250$. and hell do this stuff ith girls too. i dont know wat to do because im pissed off about this and i cant do much about it since hes bigger and stronger than i am. please help????