I don't know what your level of effort in your hapkido class is, or the schedule (how frequently you go) or what you do outside of class, but if you haven't lost weight in 3 months and that is one of your goals, you should definitely make some additional changes.
It's difficult to lose weight on exercise alone, since we have a tendency to eat for maintenance or above... Even if you've switched to a healthier diet, it's easier than most ppl realize to continue to just consume too many calories.
You have probably built some muscle, and definitely conditioned your body somewhat, but you gotta push extremely hard if you want to lose weight through exercise alone.
Otherwise, try an app like myfitnesspal to start tracking your diet. It takes some effort to dial it in so it works for your individual needs, but it really puts it all right out there for you to see. Takes the mystery out of losing weight. If you log as accurately as you can (i bought a kitchen scale) , and don't overestimate your exercise (i usually log it at half or not at all) and allow for the fact that not everyone fits perfectly in one of the three categories of activity level.. After playing around with all that, results are pretty much inevitable. If you don't see results, just know it's almost certainly one of three things, either you're under logging food, over logging exercise, or over estimating your base activity level.