Step 1.
The first step to becoming epic in Gmod is to subscribe to this addon:
https://steamproxy.net/sharedfiles/filedetails/?id=2203246561

After you've subscribed, go into Gmod, choose a map, start a new game, and change your playermodel to the one you just installed.

Step 2.
The second & last step to becoming epic is to become one with the troll face. Embrace the troll face. Embrace everything thing about it. Everything else is meaningless and you are now epic. Everyone will love and care about you now.