I can play 1. e4 as long as my opponent does not play 1... c5.
However, I have recently been succeeding in playing 1. d4 despite knowing little to no theory. The only exception is that I am booked up with regards to the King's Indian (as black). I frequently win using it, and even if I play against it I know the plans and strategy, and have no fear playing against 1. d4 Nf6 2. c4 g6.
Every time my opponent plays 1... c5 in response to 1. e4, I die a little inside. Should I give up 1. e4?