Hi Novita,
Welcome on the forum,i am a thal minor too and i was diagnosed when i was 24,my mother spent a big part of her life not knowing she has thal minor,so its normal and it happens to many people.
Do you know what your hb is currently? You should take folic acid and a few other supplements like B Complex,and Vitamin D plays a great role in your tiredness too,Vitamin D deficiency can effect you in so many ways,so you should get it tested.
And last but not least,a little exercise also helps,a brisk walk in the morning would make your day a lot less tiresome.
Hope this helps,
Zaini.