It looks like there is some great advice in here already, I will add one thing and that is: try your best not to let the rejection you experience during this process be a self-reflection on who you are and how you see yourself. The truth is that many of the people looking at your resume or running through an interview have no idea how great of a human you are and what you truly have to offer, and they are making snap judgements.

You seem to be extremely bright, curious, and observant about the world around you and the world is a better place with you in it. Good luck and keep your head up!