You have been working out for three months and haven't lost weight. There are several reasons.
First of all, you only explained the time of fitness, not the amount of exercise each time and the frequency of your fitness.
If it's not enough, you can only sweat, but of course you can't lose weight.
Then, eat regularly and do not eat snacks. These two items do not explain whether your diet meets the requirements of fitness.
What is the calorie intake? To put it simply, you didn't eat snacks, but you ate a lot. Obviously it didn't work.
Suggestion:
Make a reasonable fitness plan.