@ysmina-- There must be some fiber rich foods that you enjoy. If you like fruits, beans and whole grains, try to have more of these to make up for the lack of vegetables in your diet. And I'm sure that there is at least one or two vegetables that you don't mind eating.
You could also use a juicer or blender to make smoothies with fresh vegetables and fruits. If you use more fruits, you won't even taste the vegetables. If this is not an option, then there are fiber supplements on the market as well.
Unfortunately, keeping a healthy digestive tract means staying away from bad foods that often taste good to us. But once you realize the benefits of eating healthy, you will get used to it. Eating fresh, natural foods rich in fiber improve the immune system and give energy in addition to keeping our digestive tract in top condition.