Shari.
This is important and I hope it will make sense. It is not that the kids made you feel not good enough, it is that you believed it was true. This believing set off emotions (sadness, anger, disappointment, probably a few more.) So now every time one of these emotions crops up you automatically associate it with the thought that you were not good enough.
Now I am going to use a knitting analogy here. You have a piece nearly finished when you discover there is a mistake. Every time you look at the Piece. (You) you see the mistake. You can cover it but you know it is still there. So how do you fix it. Well you have to go back unravelling it till you get to the mistake and then and only them can you make the repair and finish the piece the way it should be. You have to unravel you, all the way back to the mistake, you can't just go to the mistake and fix it. You have to deal with all the emotions it caused first. The sadness the anger and what ever else you may be feeling because of it.
Start by picking up a pet and telling it that "I was wrong, I do not need to be sad because those children made me feel not good enough" Remember this is you, not them. It is you thinking this not them making you feel this. Every thing has to be in the first person singular here. I,I,I, I did this. I am the one that has to change not the situation, The situation is in the past. Not they were wrong but I was wrong to believe it. I again. I have to change, the cause can not.
You have to be able to let go of all the negative emotions the situation caused. You have to believe. There is that word again. I believe!. You are good enough, you always were, so be happy and let all the negative emotions go. Think happy, laugh, smile, but above all believe.
For reinforcement look in a mirror three times a day, ( or every time you see one and tell yourself three times that "I believe I was and am good enough, I (not they) was wrong.
Good luck,
Here for you.
Davit.
Ps This looking in a mirror thing is a proven thing and was discovered by a man in the year 1900 and I would have to look to find his name but it is proven to reverse negative thoughts. It forces you to look at yourself as you say it. It forces you to believe it. If you can not look yourself in the eye and believe it you never will.