Am I a light weight or do I have a higher tolerance for alcohol then I think?

i ate breakfast at around 6 in the morning didn't eat lunch and at like 3 pm (9 hours later) I had like a little over a quarder liter of smirnoff. I couldn't walk straight but managed to keep off the ground. It was my first time drinking alcohol and I kind of chugged it. I didn't eat dinner that day because it tasted horrible to me. I don't know if I was drunk or just tipsy. (thank god I didn't have enough for a hangover). Anyways like 3 days later I had a miller lite after having eaten around 3 hours earlier. It didn't do anything to me but I know vodka has more apv then beer plus it wasn't mixed. That was my trip south of the boarder. I'm not ganna drink here so I haven't been able to test my theory. I was 5'7 and weighed 130