I WORRY BECAUSE I HAVE A POSSIBILITY OF SOLVING IT

No one born into this world lives without any worries. There probably isn't anyone who gets through life without worries. If you have worries, that proves you are currently alive.

If you have no worries, it is time for you to bid farewell to this world. Having something to anguish over means that you are still alive.

Moreover, worrying means that you could possibly solve the problem depending on the way you think. This can also mean that you are now checking how much you can endure the giant wave of destiny or the trial from gods.

From "Worry-free living" by Ryuho Okawa