I RodB,
The first step could be, not to feel that way.
This can be an internal 'reaction' to thinking.
As a thought arises, simply acknowledge it as thinking, and let it go, or just let it go. This is self awareness, a good thing. Observing yourself thinking, is better than just thinking, without that self awareness. You are making progress! Simply go back to the focus in the meditation, or non thought/being in the present moment, with no judgements about the chatter.
In general, your practice experience regarding this will improve. Within that improvement, there can still be times where you have something going on in your life that increases the chatter, or an opportunity to practice in a setting that helps you quiet the mind, like a peaceful natural setting, or a retreat, etc..
When you focus your mind on something, or sit fully in the present moment, you are exercising that ability. Practice moves you to a better level of experience.
Again, know that the 'energy' is different every day too. Don't be disapointed if your practice is more focused one day, and the next, you have lots of chatter.
You can just see the thoughts as energy that you don't need, and just let that energy flow out as it comes up. You may find it empties out, or continues. No judgements, just sit in the process and know that you are doing transformational work.
It is also good, if you are observing self as the thoughts arise, to be compassionate towards self, allowing , no judgements. This can open the heart. Your experience is a good one, and we are all connected in this experience of self.
love,
gallen