do you think wasting time is bad..? because it won't come back.
If you have wasted your time in past and lost some of your objectives that you think you must have achieved but you didn't. Don't even think about it, you will waste your time after thinking about what couldn't not be changed.

So, Just go ahead.

Take experience from your past mistakes, don't repeat in present and plan your future for better time adjustments. But do not start over-thinking about future, it will waste your time though..

Thanks!