my friend that’s a nurse said there is no way I can be a type 1 as born with it
You aren't born with type 1. That's nonsense. Type 1 is an autoimmune immune disease that can develop at any age.
A history of gestational diabetes puts you at increased risk of type 2, because it shows that you are prone to hormonal insulin resistance.
How long ago was the pregnancy? Have you been having the advised post gestational diabetes follow ups with hba1c? What did they show? It is possible the GD was misdiagnosed & was actually type 1 but the birth + breast feeding allowed a strong honeymoon.
High blood sugar doesn't distinguish between type 1 and type 2. The tests to distinguish between types would be cpeptide and gad tests.