Do I have ADHD?

I don't know how to start this, I've never really dealt with stuff like this I'm 16 rn and I have done a few ADHD tests (ONLINE.). I know that all of them say strictly that these tests can't actually diagnose your ADHD and stuff but most if not all of them have suggested I have ADHD.

Don't know where to start but can anyone ask me a few questions that would be obvious point outs that I have ADHD (if anything like that actually exists)

I really wanna visit a doctor but my dad's really dismissive about this stuff. I can never sit still for more than 10 minutes unless I'm actually invested in something and I do have terrible memory .(alzheimer's or just stress? Idk 😭 😭 😭)

My dad's the type of person to hide and ADHD diagnosis from me just so that I won't feel different (don't know how an ADHD diagnosis works and if it can be done at an age where I would have forgotten about it by now)

My personal reason for this motivation to find out whether I have ADHD is that I'm always so demotivated when it comes to studies. I study just hard enough to where I don't overload my brain (in my opinion) but I can never get A1's in any exam? Ofcourse that could just mean I'm downright stupid 😭. I think posting about this on a subreddit where people have already found out they have ADHD could really help.

Thanks to everyone who's listened to me whining :))

Good day!