No matter what you want to do, do it now!
Start your own company, apply for the job you wanted, start learning for the career you have been dreaming of, change the city you live in, hell, even change the country or the continent if that’s what you want. Even if you want to quit your job, do it now. If you want to quit smoking start now. If you want to lose weight, do it now.
There is no better time to do it. This moment is the only one that matters. The past is long gone, so you don’t need to worry about it anymore. You can’t go back to start then, so stop pestering yourself about not having started earlier.
The future is not here yet. The only way you can change it is to start doing something now. Only action in the present will change the future when that moment comes.
If you want to be happy, do it now.