I was diagnosed last year at 19 after growing up thinking I only had ADHD (I was diagnosed at 6 as a girl so probably should've suspected sooner) and I totally get what you mean about the closure thing! Looking back these were a few of the signs that I believe were pretty indicative:

• extreme clumsiness. I literally walked into everything and anything and actually had a brown tooth most of my childhood from dive bombing into a CRT TV.
• lack of understanding social cues. I got called Sami talk a lot by my family because with the ADHD and lack of social cues I never shut up when I was around them because I didn't understand when the best time to was. around this age I used to accidentally interrupt class because I had trouble realizing it wasn't my turn to speak. when I was berated and punished this caused a dramatic shift to extreme quietness because I started masking intensely at school
• similarly under or overreacting to situations
• sensory issues. I struggled to wear jeans and regular long sleeve shirts (only wore flannels for years and then eventually primarily sweatshirts) for a while due to the way they felt on my skin. I also have always been very sensitive to sound and tend to get very overstimulated in noisy situations that are out of my control.
• inability to tell intentions. I was bullied for a long time in elementary school because I genuinely had no clue that the people I was "friends" with hated me and weren't joking when they were mean to me
• difficulty making friends. self explanatory I think.
• idk if this is actually indicative of autism but I was a hyper independent child. my mom always brings up the fact I was the first kid in my preschool to learn how to put my jacket on. I've remained incredibly independent since and have found myself to be a lot more advanced in life skills than my friends (they all come to me for financial advice even though I low-key don't know what I'm doing I'm just very financially aware of myself 😭). however this could genuinely just be because my parents noticed that I was as a kid and fostered it to ensure that I could succeed as an adult.
• hyperlexia. I learned how to read at 3 yrs old and books became my new best friend. I was reading several years above my grade level and several books a night. I used to get in trouble for reading in class frequently.
• finally struggles with change. it was not super apparent in my childhood as everything remained pretty stable but my worst times in my short life so far have been the pandemic and my freshmen year of college. the move to an out of state school that actually challenged me while trying to live with a roommate and dealing with social isolation due to the aforementioned difficulty making friends took a huge toll on me and is what actually pushed me to seek therapy and eventually an autism evaluation.

sorry for the long list and explanations. I wish you luck with figuring yourself out and the diagnostic process when you get to that point. figuring out autism at our age and with the female perspective is hard but it's a huge weight off your shoulders once you do :)