My advice - you will never win the Tour De France no matter how much drugs you take - it is too late. Therefore, relax and enjoy. No matter how fast you are, some skinny scrawny kid will be faster. It doesn't matter. He only hopes he is riding when he is our age.
If you remember riding a bike as a kid, remember the freedom you felt to be able to go where ever you wish - now reclaim that feeling. Pedal all day if you want knowing the only consumable you are burning is what you put in your mouth - and if there is anything we learn in 50th years, it is how to enjoy eating! Do as I do - I pedal from bakery to bakery. One must refuel you know...
And ignore people with white bikes - buy one that doesn't show dirt since surely you will be riding yours unlike some people we could name.