Talent or/and hard work breed success.
Success breeds confidence.
Confidence breeds more success
The bubble won't burst as long as you choose your routes in a shrewd fashion (and climb a lot, thus staying fit).
When I was fit and did lots of routes, I did used to feel a mental burn out at some point in the year, when I needed a break. A bit of bouldering or sport climbing always sorted me out. Still a head stress if you take it seriously - but a different type of head stress altogether.
Don't worry comparing yourself to people like Pete Robins - he is the most technically gifted climber I have ever seen. Utter flambouyant genius at the crag, and down to earth, self deprecation in the pub - a rare combination I'm sure you would agree.
