While the sentiment of not doing enough and the regret associated with said sentiment are ever-present, one also has to entertain the potential downfalls of doing too much.
Life is not without consequence, and the only deciding factor between it and success is simply a universal game of Russian roulette. Always trying to do something will yield many a success, but at the same time, will also create consequence; and depending on the scope of the aforementioned consequence, one may end up hurting those we try to help, if not ourselves.
So despite my many regrets, they are always offset by the countless times that things could have gone horribly wrong.
The best lack all conviction, while the worst
Are full of passionate intensity.
~ William Butler Yeats