That is okay, we can still pray for you and encourage you.
Actually a lot of people suffer with feeling worthless, I fall prey to it at times again, especially when I am low but that doesn't mean we can't build one another up when we have a chance and remind each other who we are in Christ. I remember posting a list of who we are in Christ...feel free to print that list and post it where you can see it everyday, as a reaffirming of who you are.