yes, although it is difficult, at least, you need to try to forget the mistake and try to not do the same mistake. I am sure that by learning more in trading or another thing, you can slowly recover your loss and you can replace your regret with the happiness that you can make in the future. besides of learning, you need to learn to accept the regret and always remember that you still have another day to make a profit. with doing this, I think you can learn from the mistake and will not regret if you are getting the loss.