You can use yourself as a data-point if you match one of the personas you are designing for, but need to be extremely careful about doing it.
It might not always feel like it, but as somebody working on a product, you have privileged knowledge about that product and the thinking behind it. A user who isn't you won't have that. A typical user also won't have as direct a means to question or challenge things or as much knowledge about how to proceed when things don't go as expected.
So you're not a typical user, even though you might think you are. You might tick all the right boxes, but you tick some extra ones as well. If you go in with that knowledge, it can be a useful first step... but you should really make sure it's followed by a second step, a third step and so on.
My advice would be that if you're going to use yourself as user zero for research purposes, you follow it up with more research to challenge anything you learn from that first step. Seek further validation for anything you learn from using yourself as a subject.
Your own experience in that situation is relevant but different to that of a user without your privileged position. Understanding that difference is important in this situation.