Struggling to maintain focus during puja, is this normal?

I’ve been facing something during my prayers and wanted some guidance.

Whenever I start worshipping God (with full sincerity and concentration), I feel very focused in the beginning. But after some time, my mind starts wandering. Random thoughts come in, sometimes past negative experiences or even embarrassing moments and they keep interrupting my focus.

Even though I continue my worship, these thoughts keep coming in between. I try to push them away, but it doesn’t always work.

Does this mean I’m not worshipping properly? Or is this something normal?

Also, how can I deal with this? Should I just keep bringing my focus back to God again and again? Is there any practical method or mindset that can help improve concentration during worship?

I would really appreciate your guidance.

Thank you 🙏