Hi Jake and welcome!
What you're feeling is completely normal and it's great that you've already come to understand that you're powerless over your wife's drinking. And it's even better that you're going to your first al-anon meeting.
There are some power posts at the top of the al-anon and nar-anon boards that you might want to check out. There's a lot of great info on enabling, detaching, etc. that might help you begin to come to terms with your anger, frustration, and resentment. Your wife has a disease and she's in denial. The best you can do is focus on and get help for yourself.
Keep coming back - we're here for you!
Hugs,
JG