Failure is necessary and painfulEveryone would like to be the undefeatable champion, and champion are not born but trained. Can I be a champion without losing or dying (in the game)? Nope. You could fast forward your newbie period by reading guides, but learning is accelerated through the adrenaline of PVP which end in frustrated death.
The more you fail the more you should rethinkFailure is the mother of success. Does that mean the more I lose/die the better I will become? Yes, only if you give thoughts to why you lose/die, and thinks of ways how to be better. If you just blindly keep dying and playing without refinement, you are just being insane: repeating the same thing and expecting different results.
You don’t learn much if you win occasionallySometimes you got lucky (killed a noob a few times), and sometimes your team mate is a champion; you won and found the game to be too easy, and then you lose the next game and start to wonder why. Loosing make you thinks for new strategy, and winning based on luck only helps your ego, and winning constantly validate your strategy.
Keep calm and take over the worldKeep clam, don’t just rush into battle even though you are a tank. Know your position (Attacker or Support), and wait for your comrades. If you are alone, wait or retreat. Not dying is as good as a kill.
It’s a Team Game“I am damn good, but my comrades suck”. Dota 2 is a team game, and it does not guarantee victory even though you are a champion hero (though it increases the odds). Coordinate attack with your comrades (doesn't mean you can shout and boss people around by massive clicking, and be angry when people ignore you).
You can blame your comrades, but it doesn't help you win.You can choose to party with a champion player, but make sure you learn something from it.