Did you build the website? Yes
Did you build your blog? Yes
Did you design the property development? Yes
Did you renovate your house? Yes
Did you launch the product? Yes
Did you manufacture the product yourself? Yes.
Did you landscape your own garden? Yes.
Did you make that advertisement? Yes
Did you self finance the business? Yes
Yes you did all these things, and more, every bit of them. You orgnaised the project, you had the idea, you got the finance from the bank, you conceived it and you made it happen. Never mind if the advertising agency made the creative, the PHP programmer coded your website or the bricklayer built the house.
You did it with your mind, your management skills and your ability to execute the project. None of it would have even started without you.
So whenever anyone asks if you did it? You say “Yes”.