Keep positive.
No matter who you are, you WILL leave a pocket split, something in the backrow, a fast 8, etc. etc. Not every pocket shot will carry, not every ball reaction will be the same.
The quicker you can tell yourself, "get the wood, every pin counts" and shrug off the poor shots, the better off you will be. The minute you let doubt creep into your mind, you will NOT be bowling well the entirety of the day. Bowling is infinitely more mental than physical. Staying positive will help keep your armswing loose, among other things, and help you get optimal ball reaction.
Know your adjustments, know the courtesy and etiquette, and have fun! You're doing something you love, why should you be such a worry wart?
--------------------
Proud Supporter of Rob Stone
Obviously, you aren't a golfer.
Some stayed in the foothills, some washed logs like teeth.