How to understand if I'm bleeding too much during menses? I get quite some blood clots. I misinformed my doctor saying its normal I suppose.

Hemoglobin level. If you hemoglobin level is below 12 gm you are anemic. Even if you are not anemic yet, you may have low body store of iron due heavy menses. It would be appropriate for you to take oral iron supplement and multivitamin. At your next visit to the doctor you should express your concern about excessive blood loss.