In the final analysis retirement is just life going on, you will not change, you will like and dislike and do or not do all the same things.
You will face all the same difficulties and perhaps some new ones. The gap in time left by no regular job will quickly be a filled and in less than 12 months you won’t notice it.
Your income will ultimately be the throttle or brake on your spending.
Look forward to each new day even the mundane ones and keep making plans for the future.