I think I have ADHD but my parents won’t have me tested

I’m almost certain I have ADHD. All of the signs are there. But there’s a little shred of doubt in me “what if it’s just my personality, not a brain issue” and dumb stuff like that. They don’t make sense, but they’re always questioning it. Whenever I ask my parents, they say “no you’re fine, there’s nothing wrong with you”. I don’t think having it is something wrong with me, I want to know. I would explain so many of the things that I do, that I can’t help, even when I really try.
About 2 hours ago, I was talking to my dad. He’d had a little to drink (not drunk) and admitted to me that my parents have long suspected that I do in fact have it, but are afraid of me being prescribed medication which would alter my brain chemistry. I don’t want that either, but I still want a professional diagnosis and tips or methods (or I don’t know what) on improving. I need confirmation. What do I do?
Should I keep asking for an appointment for diagnosis or should I give up. If I should keep asking, how can I convince them to let me?

how badly does it affect your life? tbh adhd meds like adderall can be pretty bad for your health.
still, it wouldn't hurt to see a professional, they might give you some tips. you don't have to go on meds if you don't want to. how old are you? are you old enough to see your gp on your own? or maybe see your school counselor?

I’m 16 but I definitely don’t want to go behind their back. Honestly the symptoms are quite bad (I think) I kind of want the diagnosis as a kind of pass on things (not in a bad way). I’m a drummer, so most often when my minds wondering, my hands and foot are tapping away, and I’ll get asked to stop, and it’s really difficult because I don’t know, and then people get angry with me and aaarrrggghhhh. Or when I accidentally interrupt someone while their talking. I feel like a lot of the circumstances that have made me feel really bad could actually be a diagnosed condition. I don’t know if that helps but I want to know.
I don’t want to sneak around my parents wishes though

Can we ask what your symptoms are?

Poor attention, can’t focus, always fidgeting, interrupt people when they’re talking, finishing people’s sentences, always bored, can’t do one activity for more than between 5-45 minutes (except for drumming which really helps), making careless mistakes in work all the time even whilst specifically knowing what I’m doing, can’t stay in one position for long, everlasting energy and desire to go burn energy (I really want to ply tennis even though I don’t play tennis). I’m sure there’s a few more that a can’t think of. These are the main ones

*expecting

You know you can just edit your post right?

I can't, because they're anon.

Oh. That’s a shame. I might not have ADHD or ADD but I want to find out. I don’t know what to do 😖