I was diagnosed when I was little, so I luckily never needed to figure it out from scratch, but having a sense of why you are the ways that you are is a lot harder than applying a label to it. It can help if you take therapy to learn how it impacts you or if you read a lot about autism from professionals/fellow autistics you can figure out what aspects of it apply to you and what parts of this originate from your brain being wired differently. Everyone is an individual though and its a spectrum

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well you are probably autistic due to genetics

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I also need this information

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Read the dsm-5 many times and also watched videos explaining what each diagnostic criteria means and also took raads r test many times and also took idrlabs autism test multiple times and also had a bunch of (autistic) friends tell me I am

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Genuinely, knowing all the intellectual answers did nothing for me. Being validated by someone I looked up to who also has the same diagnosis and getting to talk about it together helped 1000000x more. (Needing to know why can be a need to process things emotionally. Validation and acceptance does that.)

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