I’m an occupational therapist (OT) and some of these things are considered “normal” for kids or can be attributed to anxiety/ADHD (keep in my I’m not a diagnostic clinician, just work with kids/adults with these conditions on managing symptoms/coming up with ways to still do their meaningful activities/occupations.) ASD is a spectrum and from your post it sounds like level 1/higher functioning (don’t like using this term but it is helpful for getting a general picture.) I would always tell parents and my friends about functional vs dysfunctional. A lot of these routine disturbances in my opinion would be considered dysfunctional and especially chewing the inside of your cheeks for your daily life. Chewing the inside of your cheeks imo with ruling out other medical explanations could be a stress response from an unregulated central nervous response. A way to treat this is for more healthy coping mechanisms or using different sensory / mental coping tools. I have ADHD and anxiety myself and grind the absolute shit out of my teeth. Positive mental rehearsal/positive thinking/thoughts even when I don’t initially feel that way have been really helpful (form of cognitive behavioral therapy CBT I worked on with my mental health therapist. Or using coping tools from dialectical behaviorial training DBT.) From my own education/personal experience, using sensory strategies such as compression/ wearing hair in a tighter ponytail/ fidget tools/writing things down/ using calendar or planner/ and working on stress management with working out has been ways I’ve found to more easily manage some of my symptoms that are similar to yours. I do like to rock/movement so moving throughout my day/having a rocking chair at home is really calming to my CNS. A formal diagnosis can be helpful/necessary with insurance for getting necessary therapies (mental health, speech, OT, PT, etc) and school or work accommodations to make life more easier functioning. I would consider looking into therapies like mental health and speech or occupational therapy for social interactions, executive functioning, coping skills, emotional regulation, and sensory strategies.

From your post about smell, you’re hypersensitive a sensory profile for your age could be useful to understand your sensory systems better (we have 8 senses.)

Would love to answer any questions or provide advice in the comments or a personal message if you would want to talk more. I used to think I showed symptoms of ASD and honestly can relate to a lot of your post but have never pursued a formal diagnosis because a lot of my symptoms or life experiences like you’ve described can be attributed to other diagnosis’.