"I must do something."

Just do it... 

We avoid taking responsibility. Whether it's in our job, or for tasks around our home, or even for our weaknesses and sin. 

We want everything to be someone else's work or fault.   

I can't remember the old adage in full, but the gist was Everybody is waiting for Somebody to do what Anybody could do, but Nobody is doing. 

When some folks approached Ezra about their sin, he told them they needed to repent themselves. He said, "Arise, for it is your task, and we are with you; be strong and do it." (Ezra 10:4 ESV)

Don't blame sin on anyone but the man in the mirror, but don't forsake those repenting. Receive them. Help them. Love them. Keep them accountable. 

Also, about taking responsibility in general, just do it. The attitude that says "I must do something" will always solve more than the attitude that says "something must be done."  

Let's not wait for the hospital bed or the coffin to get straightened out. Let's take responsibility and get straight now.