my screen is all black and it wont let me spawn or anything

It happened to me as well. If you are using a pc, do Ctrl + Alt + Delete, end process. Restart minecraft. If you're using a mac, do the equivalent command (I don't know what it is, though). This fixed the problem for me.

command-option-esc for mac. <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f609.svg?0" type="image/svg+xml" standby=";-)">;-)</object>