Eating Healthy But Still Underweight :(

A few months back I started my journey to healthier living (no junkfood, no fast food, no softdrinks, no unnecessary carbs, exercise daily, drinking tea) because aside from wanting to be healthy, I wanted to lose my belly fat. Unfortunately, now I am underweight. I’m not starving myself at all; I eat regularly and a lot but I limit myself to healthy food. I don’t want to start eating more because some of my belly fat are still there. Any tips on what I should do?