What's this "tough stuff" you speak of? Please elaborate.
Well, just that actually being
in a relationship takes a lot more effort than starting one.
Just getting a date with someone... Sure, that's a lot of pressure and takes a certain amount of courage to initiate. But it's still basically a pass/fail. And if you were to really dig into what constitutes the "saving throw" in the mechanics of asking a girl (or guy) out, I'm reasonably certain that
how you ask someone out, or what you say, is merely a modifier on the skill check - the base chance is already decided beforehand anyway. (ie, there's either enough of an attraction that whatever you say won't make a lick of difference on the outcome, or there's not enough for anything you say or do to make any difference.)
Even a healthy, happy, long-term relationship, however, has a lot more complications involved though. At the beginning of any relationship either it works out or it doesn't. And if it doesn't, that always svcks (breaking up is rarely easy, at least in my experience.) But the stakes are still pretty low even then, you've only invested so much time and emotion into the relationship. Get a couple years in, have a kid... That's where things get difficult.
Basically, getting any kind of relationship started - it's all about whether or not you're both attracted to each other and available. There's variables that feed into that, of course. But that's essentially what it comes down to. You can pile a ton of effort into asking that one question, but that's essentially the only thing you have to worry about at that point.
Myself, I'm a happily married man with a wife and kid that I absolutely adore. They're the best parts of my life. But it's still very difficult and takes a lot more thought and energy than simply worrying about whether the girl who sits next to me in Chemistry is going to circle "Yes" or "No," in the note I passed her.

Of course, I don't mean to sound dismissive. Like I'd said - I've done the angsty teen thing. It's always hard when it's you going through something, no matter how easy everyone else might say it is. At the same time, however, it's an age-old tradition for married people to look on the complaints of single young people and shake their heads in a bemused manner. It's essentially the "First World Problems" of relationship memes.