How long can you go with undiagnosed Type 1 diabetes? Stupid i know, but please help.?

I have been having symptoms of diabetes (i am 14) but i don’t know if it is diabetes or not. I am not sure how to tell my mom that i think i have diabetes, so i was thinking about waiting another week and seeing how i feel then. My symptoms have been going on about a week now.

SO my question is, how long can you go with undiagnosed type 1 diabetes and still be perfectly fine?