Here it's Crash Report
Plz Fast Help
your pastebin is gone, probably because you set it to limited time.
but one thing i can already tell you: don't assign more memory than you need. go down to 4gb, just for testing. you can always see your memory usage in the f3 screen, in the upper right corner.
My own Modpack. Yay.
HOW TO MAKE A CURSE MODPACK. it's no full tutorial, but i link it here anyways.