Well done, secretchord. Both giving it away and proving that you can sing sober...
The thing with friends is that we either surround ourselves with heavy drinkers just like us - or we don't. Heavy drinkers are not going to be on board with you. They just aren't. You may find that your "friends" were really just drinking buddies. It's a hard truth. The other thing is that most people don't drink to oblivion. I know I drank for the buzz, the high. Most people (like 90% - it's a thing) will have one or two drinks the whole night. I know! I didn't believe it either.