Loss is a part of business. I hold my coins when they are in loss if I believe in the project.
There a lot of ways to deal with loss; if I loss small amount of money, I will just rest for a while a try it again, as what others said: try and try until you become successful. To have a loss is normal, just deal with it positively.
Yes,we need to experince in dealing a loss because it hepls us to be successful for the second time. It teach us to become brave and strong in such a loss. But be careful to the next step we want to do.