Kids: Don’t be Batman. Batman’s life sucks.
He doesn’t always win: two of his Robins died under his watch. Plus, he can’t even enjoy his victories because he doesn’t have the time: he must always jump to the next case.
All the chicks like him, but his “mission” keeps him too busy to enjoy their company. He must keep everybody he cares for far away from him in order to get them out of harm’s way.
He truly loved two women, but both were on the opposite side of the law. One of them, the sociopath daughter of one of his worst enemies, gave him a son, who she kept hidden from him until the kid reached the age of ten. Shortly after Batman met his son, the same woman brutally killed him.
He can’t smoke, or drink or use any recreational drug, or eat any delicious treat, because he always must be in top physical condition.
In order to keep that condition, he must be constantly training, to an exhaustion degree, pushing himself to the limits of human resistance and beyond. He can do a lot of awesome and incredible things, but can’t enjoy doing any of them or show anybody what he can do. He never can kick back and relax.
His life and nights are haunted by the memory of an event that happened to him at an early age, which changed his life for ever: the death of his parents. Because of that, he never developed a sense of humor or the ability to feel happiness, and he couldn’t ever go to a movie theater again. His main source of entertainment is looking for criminal data on his supercomputer.
He’s unable to discern who loves him from who doesn’t, that’s why he treats friend and foes like crap all the time.
He trusts no one.
In spite of all the effort he puts on doing things nobody can, many of his close associates, in the Justice League, can do, effortlessly, a lot more than he ever will, like flying, deflecting bullets, moving at the speed of light, read minds, etc.
He has the coolest cars and toys ever, but is unable to enjoy having them: those are just tools in his fight against crime.
He’s a billionaire. One that can’t enjoy his fortune.
And the list continues.