Is it the parents' fault or some other factors?

This I guess is an issue of nature vs. nurture. Both factors are deeply involved on how you will become. Nature is the clay and nurture is the mold. We are sometimes predisposed by our genes to being someone but the nourishment that we are getting from our parents and from the home we were raised in could either reaffirm or repel these predispositions. How nature and nurture works hand in hand. Some people are self-critical in nature and this characteristic might just be strengthened if the parents won't be giving enough support or do things to strengthen the confidence of their child. If the parents are too critical of their children, then perhaps it would have a greater damage to those children predisposed to having a low self-esteem rather than those who are not. Some children, no matter how you put them down, they will still find a way to build their confidence and be resilient among criticisms. Anyway, the percentage on the effects of nurture and nature varies for each person but the fact remains that no matter where a child is predisposed to, if the parents would be caring enough to help develop their child's good points and counter the bad ones through their teachings, then they may be able to make a difference.

I guess it all depends on each child. I was brought up in a very loving home and encouraged 10000%. I am however extreamly shy and have big stage fright. I hate large groups and I dont like talking in front of big crowds. My oldest daughter on the other hand she is 7 and has the most out going personality I've ever seen. She has a lot of disipline and is a well behaved child for the most part. She lives in a loving home and is encouraged just as I was growing up. She honestly does not care what people think of her. I love that the most about her. I just hope that she continues the personality as she get's older. So, all in all I do honestly believe it just depends on the person and has nothing to very little to do with how they were brought up.

I always praise my kids before i explained to them what should he/she have done, i tell them what happens today could be our Fault (as parents) but the next time will be theirs.

First of all, you did post a really great topic, and yes I agree, parents are also guilty for there children's behavior and attitude. Like you I also have a low self-esteem, that's why I can't get a job. I discover the cause when I become more matured that my parents action and system in us are really not right, there words, advice, but not totally all. Of course they are my parents after all and I love them so much but I just only noticed it, for all the time that I listen to them, "Not this, not that, don't do that, don't go there, just stay here" . But now, I learned to listen to myself and practicing to strengthen my self-esteem. :)