Do i have a low attention span rant

I'm 13 but i feel like i can never have full attention on somthing but also can't pay attention on many different things at 1 time because then when i have full attention on somthing i tune out most things that going on around but i can't just look at one thing at a time witch make it easy for me to get bored to the point i skip youtube or any movies or shows because i get bored even if it boring for 1 second or i just igrone it and go onto tiktok but in a complicated way like yes i can play a game or watch a vidoe and not get bored on a topic but then i want to see more stuff like how i watch youtubers getting exposed i get bored if you talk about one thing for so long and not changed topic or create somthing to make me be interested and i don't know why i thought i might have adhd but then i know my grandma won't take me to a docotor because she dosn't think their somthing wrong with me even though she yells at me for doing the same stuff my brother does that has adhd and autism but i don't think i have either since my grandma says their nothing wrong with me and it just a habit so i think it just a low attention span which idk if adhd or autism or both but it would explain why i behave a certain way or get obsessed with certain things but at the same time i don't wanna self self diagnosed just in case it is low attention span but heres my little rant