Do i have a pinched nerve?

Your dad could be right and it could just be a pinched nerve. Sometimes there are such things as para vertebral muscle spasms that persons get in their back. If it doesn't get better, I would have the doctor look at it. It doesn't sound like you hurt your spine though because the pain is off to the side, but you could be having a muscle spasm instead of the pinched nerve. Give it some time, apply ice to the area for 20 minutes, off for 20 minutes, heat for 20 minutes, off for 20 minutes, repeat the process and see if that helps you. Good luck, sounds painful.