What should I do about my doubt concerning the fasting of my early years of puberty, and do I have to make up for those days?

If fasting has been your habit since childhood, the presumption is that you have fasted, and you should not pay attention to doubt. If it has not been your habit, then you may act upon the testimony of your family. If they say that you fasted, then nothing is required of you, because rulings are built upon the predominance of conjecture. If there is no predominance of conjecture regarding the fasting, then you are obligated to make up the fast, because the default is that the action did not occur. All of this applies unless the questioner is suffering from obsessive doubts (waswasa); if she is suffering from obsessive doubts, then nothing is required of her, and she should not pay attention to the waswasa.