Emulate honorable people instead of popular people.
Never use 'telling the truth' as an excuse to speak without thought or compassion.
You are 100% responsible for what you say and what you do. Own your shit.
If someone is trying, but struggling - encourage them. If someone is struggling, but not really trying - encourage them.
Don't waste your time trying to 'be a leader' or climb any corporate ladders. Just do your job and be kind, generous, truthful and compassionate. What is meant for you will be for you.
Read. A lot. From actual books. As many as you can get your hands on.
Stop putting yourself down. Seriously, it's not fucking helping you. AT ALL.
It doesn't help that our culture - especially internet culture - loooooooves self-deprecating 'humor'. We even put ourselves down for putting ourselves down! I've had a lot of success with trying to focus more on my triumphs than my failures. It's all about the language I use with myself, I've found. When I have a victory (even a small one), I say "Good job! You nailed it!". When I fail, I say "Well, that sucked....but you'll get it next time. Keep trying!". Most of us don't have our own personal cheerleaders, so we have to become our own. :)