Your problem is not that you're late. Your problem is that you lack respect for other people's time. If you really think there's no need for you to be there at

Your problem is not that you're late. Your problem is that you lack respect for other people's time. If you really think there's no need for you to be there at 9am, talk to your employer about it and try to get flexible time. Although I suspect you'll end up pushing it to the limit. In any case, please be aware that people shouldn't be waiting for you and that's highly disrespectful to not show up on time.