Hi Jart,
I commend you as a young Catholic who cares enough to research your question. I just need to make a couple of points.
First, really be honest with yourself regarding the amount you drink and if your decision-making capabilities are altered. I am not calling you a liar by any means as I was not there, but would note that “I still know what I am doing” is said by thousands of people before they do something they later regret. Try to remember all of the times you have become intoxicated and create a mental list of your actions. Would you repeat all of those actions today, while completely sober? If not, then your judgment was affected.
Now to my second point. Let’s assume that you were not drunk. Controlled drinking is not a sin. However, you are bound by the laws of the state, which Jesus expects you to honor. The breaking of the law is your sin in this case. I know that you see people speeding and breaking assorted laws every single day (this being why it is sooooo important that we set a good example for our kids and young adults), but the fact that others are sinning does not excuse our own.
It is easy to be right when the rest of the world is right. We make Jesus proudest when we are doing right while the rest of the world is doing wrong!
God Bless,
Jeff