If he’s like my ex-husband, he’s trying to impress someone, maybe a parent, and he’s spent a lifetime trying to impress that person to prove he’s “good enough”. In ex’s case it was his maternal grandmother who had raised Ex and his sister after their mother died. Grandmother always compared Ex to her much exalted son, Ex’s uncle (ex-SIL confirmed this to be the case. G-ma was apparently something of a battle ax).
Ex can’t really enjoy anything for its own sake - he has to be the best. He lacks the discipline necessary to reach the elite levels. For example, he wanted to be successful as a bike racer, and in fact did have some local wins and placings early on. But he wouldn’t train unless the weather was ideal and ate all the wrong things. A 5’9" sphere doesn’t win much.
The thing is, very few people do have the drive and the means to reach the elite levels of anything. And there is nothing wrong with accepting that. Ex couldn’t see that - and we argued about it a lot. He had to “prove” he could succeed to impress his dead grandmother.
The difference is that Ex didn’t try to con anyone into believing he was something he wasn’t. There was no grand conspiracy to thwart his ambitions and when he lost he didn’t accuse people of cheating or doping. He was just perennially unhappy.