I thought I was a "healthy" drinker for many, many years. I was an active person, had a good job, family, etc and I drank all the time and was for the most part not too much the worse for wear. Little things started creeping up though - anxiety here and there, worse and worse ( and sometimes no ) hangover. Drinking more and more alone, drinking more often, and eventuallly NEEDING to drink just to feel normal.
The bottom line is that there are certainly a few "outliers" who drink heavily and escape the odds and live to be 90 or so, but for the vast majority it ALWAYS catches up. The only question is when it starts getting bad, and how bad it gets.
Carl's response was a great one for you I think - just try quitting for a bit and see how it goes-and if you can't quit you know you have a problem you need to fix