Many of us get stuck in "can't", "stuck", lack of confidence, etc. I've been there. My value has everything to do with what you do for the company and can do, not my attitude/feelings/assessments/world-view, but these limit the opportunities I see and affect my emotions my your experience. This was impossible to untangle on my own, but with Landmark Ed's Forum I managed. Life is much better on the other side.

To start, tell your boss you need an hour a day to keep up with technology and then stick to it. Yeah, some days I'm too busy, but usually I make the time. And ask for whatever you think you're worth. Ask nicely and say you've been doing more and more at the same wage and think you deserve it. If no raise comes, shrug it off, don't react, and quietly look for another job. Most raises happen during job changes. Courage doesn't come from confidence or lack of fear, it's the name we give for acting in the face of fear.