This is a bit hard to answer because some of my rules, I wouldn’t share with anyone because they relate to intel and defence, having said this, here are some things that I tend to live by.
This doesn’t mean that you have to be a friend to everyone, or that everyone has to be your friend, but like Aldeskwatso correctly pointed out, it’s the people you meet and fly with in Eve that keep you hooked in. Having played for a while, there are some people who I now count as friends, in Eve and in RL.
Never ever go AFK (or if you do, don’t be surprised)
A fundamental rule in Eve is to ‘Never fly a ship that you can’t afford to lose’. (because basically the minute you undock you are subject to attack). This rule is, to a degree, nonsense.
Before someone calls for me to be podded as a heretic, let me explain.
The reason this rule is not entirely robust is because while you might fly a cheap (to replace) ship early on in your piloting career, sooner or later you’ll want to fly something better, faster and substantially more expensive.
And here’s the issue, while it might be a nice idea to have so much Isk in the bank that you can replace each and every ship you own instantaneously if it get’s destroyed, most people will never be that rich.
So here’s the rule, whenever you fly, be focused and present in the game. If you’re not, if you go AFK, when you get back, then you might find that you have lost your ship.
This will sting. A lot.
The follow-on rule to the above is to develop a fairly resilient and tolerant attitude to what happens in the game.
Sooner or later, you will lose ships, get robbed, be cheated and probably get harassed by other players. Some of them will be vicious and nasty and some may even enjoy knowing that you’re distressed and upset.
This should be a learning experience that you draw upon to grow in the game, but it doesn’t necessarily have to change who you are. Take a deep breath, learn something and then move on.
If you need it seek support and help from friendly pilots like the anti-gank alliance, and so on. There are good people out there, you just need to find them.
You are who you are
There is a school of thought that suggests that people play Eve in a completely different way to who they are in RL. I’m not wholly convinced about this.
I tend to take the view that no one is that good an actor to consistently play the game in a completely different, psychological, way to their RL personality. On this basis, Eve can make you a better, or a worse person, if you really want it to.
If you do want to play and act like a misanthrope in the game, you can do this, but do it knowing that if you do it probably reflects and influences a little bit who you are in RL
I choose to play as a Jedi, not as a Sith personally on this basis.