drinking uv vodka...how much ?!

ok so im 15 i will b 16 in 3 month so pretty much 16, and i am a girl
me n my 3 other friends are having a party and we have 2, botles of uv vodka each a liter
i have drank b4 the most was probably about 6 whine coolers and a bottle of beer( which didnt really do anything for me, my 1 friend got drunk others were tipsy and i was pretty much fine, a little bit tipsy) and i dont mean we shared we each had 6 coolers and a beer

i dont want to get to drunk so i was wondering about how much of uv would get me tipsy ???