Most of us think we are eating healthy. However, without tracking what you eat (and drink), it’s mostly a guess. And, while there’s no way to spot reduce your “small beer belly”, you can drop excess weight by consuming less calories than you expend. But, in order to do that, you first need to know how many calories you are consuming on a daily basis. Pay particular attention to excess non-essential calories (ie. alcohol) and portion size.
If you’ve read any other posts on this site, you’ll see that a common theme is to keep a food journal for a few weeks. Doing that will give you a more accurate picture of your caloric intake rather than guessing. Having that bit of knowledge then allows you to make the necessary calorie reductions to affect a weight loss.
Lastly, all of us have some guilty pleasure that we find hard to give up. Rather than a total restriction, think about cutting back. For instance, pick one day per week to consume alcohol, or, any other guilty pleasure. At that rate, your diet would be spot on 85% of the time.