[emrah]

Hindsight is 20/20. Try not to judge your past actions with current knowledge, that's simply unfair.

The question is did you make the most of the information you had available at the time? If yes, then there is nothing else you could have done. You couldn't have acted differently since you couldn't have known what you know today.

If no, then try to learn from the experience and move on. You can't change the past so no point in dwelling on it.