It's not too late to go back to just kissing and talking and telling him you need to slow down in order to enjoy it. Just the info you gave in your opening post is enough to start with. When this technique was first proposed it was suggested for married couples who were having a hard time, so it's definitely not too late.

If you're not ready to do more than kissing right now, that's okay. It means when you are ready to go forward, you'll be able to enjoy it more.

Sounds like you've already figured out that combining drinking with this is not a good idea for you, at least, not until you're feeling more comfortable with yourself.

You've given no indication of how old you are or how old your partner is. I hope you're both mature enough to have made arrangements regarding birth control before intercourse happens.