As others have said, that's a good effort after a long lay-off. For the future, if you're going to be out for less than two hours, don't bother taking food. If more than two hours, I'd eat something - banana, flapjack, something like that - after one hour and each half-hour thereafter. Drinking is more important, you need to stay hydrated.

You're obviously in pretty good shape, you'll find that your stamina on the bike increases rapidly. If you want to make the fastest possible progress I'd suggest riding for an hour at a time at the fastest speed you can maintain for the whole hour. It builds endurance.

Enjoy it, there's nothing better.