What are the signs of mild autism in a child?

I used to bite my fingers and hands to self regulate. I sucked my thumb sometimes too.

I made too much eye contact, I just stared at people's eyes for very prolonged times often causing discomfort.

I had limited interest in another children, I normally played just with my brother but no other children. I occasionally played with my cousins.

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Anything could make me laugh to the point of annoying other people.

I didn't pretend play like the other children. I didn't know how to do that specially with other children.

I interacted with older or younger children and if I didn't have that chance I talked to some teachers.

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I had a fantasy world, I was always there and that was the best place to be, when I was anxious I went there and zone out.

I loved to run from one side to another side and jump a lot, I always did it everyday.

My reaction with other children apart from my close family approached me was mostly walking away or hitting them.

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SIGNS I HAD AS A BABY (0–2 YEARS)

I had trouble sharing objects and food, normally someone had to tell me to give them something. I sometimes didn't want people to have my objects to the point of meltdowns.

I copied people from TV shows or films, their way of walk, talk and personality.

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I was a calm baby, I didn't cry that much and I didn't need another person's entertainment.

I watched some films over and over again specially my favourite scenes.

I will answer this question showing my signs of autism I had as a child:

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I learned many skills like reading and writing earlier than other children.

I had trouble answering questions about topics that didn't interest me or I just didn't answer.

I was very obsessed with angry birds, I played angry birds, I had ab toys, I watched ab in TV and I was so obsessed with that.

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I wasn't unable to get non verbal communication and non literal communication too.

I was over or under sensitive to most sensory input causing sensory seeking oravoiding reactions.

I also didn't group play, I was physically close to those children but I was parallel playing most of the time.

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These are my resumed signs of autism when I was a child. Most of them got overlooked because the only thing about autism my parents and grandparents knew was about very severe cases of autism. Another factor is that I was born female (I'm trans) and that I masked from a young age.

I always had a justice sense, if there was no equality or justice I would get very upset about that.

I loved to stay alone in my room drawing or playing with my legos, I could do that for hours.

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I didn't have a social smile and I sometimes had exagerated facial expresions or just expressionless.

I used to hit my siblings very often, that was my way of playing with them.

SIGNS I HAD AS A CHILD (3–12 YEARS)

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I woke up and threw all my toys away from my crib and start crying.

I didn't know why people felt happy or sad in determined situations.

I was under sensitive to bowel and bladder feelings but other Interoceptive feelings felt just too much.

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It was very difficult for me to get social cues so I had inappropriate responses many times.

I had trouble to be fed. I ate slower and it was difficult for me to stop drinking from the bottle or breast. I also had trouble eating solid food.

I had problems to follow instructions and to follow rules, I always got in trouble for this one.