Is this normal for my knee to feel like this?

My personal opinion (and I'm not a doctor) is that you could have either popped the kneecap out of place or broke the kneecap. My ADVICE is that you go see your doctor or head to the nearest hospital emergency room, where they can do x-rays and a proper assessment. Although I am NOT a doctor, I AM in the medical field and have knee issues as well, so I would also advise you to ice and elevate your knee and rest as much as possible. Unfortunately, you may not be able to work for the next few days. If it hurts to walk, definitely do not go to work! You could injure yourself even more.