I think the issue is more in how you’re approaching the game. In that you’re picking one class, deciding that’s the only class you want to play. Picking one sole build (WW barb). And deciding that’s the only build you want to play. Of course that is a very stale way to play a video-game which gives you more options.
Try making up your own builds and playstyles and pick up different classes as well. The game is just for entertainment purposes. It is not a job or a competition.