Nah! Life is too short for regrets.
If you are in a pretty good space right now and pretty happy then you have arrived. Whatever decisions good or bad you made in the past led to this and now it's all good.
If you are not in a good space right now and not happy then looking back and regretting is not the solution.
The solution is starting today with a clean slate. Day 1 of your new happy life. Enjoy!