The 90-9-1 Rule
90% of users are "lurkers" (i.e. they read or browse but don't contribute)
9% of users contribute from time to time, but other priorities dominate their time
1% of users participate very often and account for most of the contributions
From Jakob Nielson
So don't feel bad about. Enjoy lurking. We all lurk, we all contribute from time to time ... and I dare say there are places where we all contribute very often.Just not here.