Don't feel embarrassed because you can't do pull ups yet. You can build up with easier variations! Here's an exercise you can do to help you get your first pull up. Use a step stool and raise yourself to the top of the bar, then slowly let yourself down.
This focuses on the "eccentric" (lowering) part of the movement -- hence the name "eccentric pull up." Do these a couple of times each week and you should be able to increase your pull up strength and stability. Plus, you strengthen the wrists.
Have a great day!