Is this normal?

Engage your muscles as you **. Separately, try tightening your toes, fingers, and abs. Then try tightening all of them at once. Try squeezing and holding your PC muscles too. Keep switching back and forth until you notice that one of the strokes feels better than the other. Stick with that stroke for the remainder of your session.
Try going a little harder and faster with that same stroke. You’ll probably notice your level of pleasure ebb and flow. Don’t analyze what’s happening - just keep your focus on the sensation in your body. Up the speed and pressure a little more, and see if you can let yourself go over the edge. It may take longer than you expect, so keep going until it stops feeling good.
Ears ringing are normal,
Enjoy!

Yes , welcome to the world of climax