COVID vaccine gave me diabetes???

Hey everyone, I'm 22 and I found out that I had diabetes around a year and 3 months ago, I've had high blood sugar for months before that but I've had no idea that it could be diabetes because no one in my family has it and I wasn't educated enough about type 1 diabetes, so later on I went to my doctor because I had some COVID symptoms and he randomly said when I was telling him about my symptoms that many of the people that took the COVID vaccine, especially sinopharm got type 1 diabetes, so I stayed silent for a bit before telling him that I now have diabetes and that's the vaccine I took last year...and fast forward to now, a classmate of mine asked me about my diabetes and said her sister has it too since she took the same vaccine, could it be that the Chinese COVID vaccine has given me diabetes or is it just a coincidence? Excuse my bad English and thank you in advance