What are electrons made of?

ok so this is really random, but I am in the middle of studying (not very hard obviously lol) for a chemistry test, and I have to memorize the different chemists and physicists who helped develop different atomic theories (Dalton, Thomas, etc) so I got to thinking, what exactly are electrons / protons / neutrons made up of? I guess energy, but I cant really rap my head around my key board being made up of energy.... any thouhts?