yeah honestly there's a lot that can go wrong and give a person a bad experience biking. unmaintained shitty old bike? probably is a harder to pedal and horrible rolling resistance. Bad gearing? either super slow or super hard to pedal. frame too big or small, or seat not properly adjusted? that's gonna suck

So if you never get into it as a kid, and can't really do it even just for fun, its kinda no surprise.