ASD/PDD vs schizoid disorder vs NVLD

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How to differentiate betwen these three, especially in children who are about 4 - 9 years old (but also in older children, adolescents or even adults)? What are diffences between schizoid personality disorder and ASD/PDDs (especially Asperger syndrome), especially in childhood?

I have an "obsession" about the correctness of my PDD/Asperger's diagnosis which I received in a centre specialised in autism and PDDs when I was about 17 years old (it was 17.10.2008, above 12 years ago).

Asperger syndrome in ICD-10 (which is still used in my country now, but it should change in 2022 probably due to introduction of ICD-11) and DSM-IV(-TR) (used before DSM-V in which there is "only" autism spectrum disorder which has three levels of severity) is in serious subcategory of mental health problems named "pervasive developmental disorders", but schizoid disorder is "just" a specific personality disorder (like, for example, antisocial PD, avoidant PD or paranoid PD) and NVLD is generally considered "just" a learning disability, a specific developmental disorder (like dyslexia or dyscalculia).

I think that the diagnosis of PDD helped me quite a lot in my life. I had extra lessons (revalidational hours) from mathematics and physics in high school (called in Polish szkoła średnia) because of Asperger syndrome diagnosis (I had unsatisfactory marks after first half of school year 2008/2009 from these subjects). More importantly, in 2015 I received ruling of moderate level of disability due to special illness (mental illness) in August (and my disability started before my 21st birthday) and (in October) ruling of total incapacity of work in Social Insurance Institution which gave me social pension (equivalent about 200 USD for a month) - when I received them, I had not only diagnosis of AS (a PDD), but also diagnoses of schizophrenia-type disorder (a mental illness coded as F21 in ICD-10) and OCD. In November 2020 I even got ruling of moderate level of disability not only due to mental illness (code 02-P in Poland), but also due to pervasive developmental disorders (code 12-C) because of my constant diagnoses of a PDD (AS) which has code F84.5 in ICD-10.

I am above 29 years old now and in one of the largest Polish cities people being above 26 years old with moderate level of disability who have it due to 12-C (a PDD) (or/and also due to intellectual development disorder, symbol 01-U, but I have not low IQ) have no need of buying tickets at all while ones who are after 26th birthday and have just moderate level of disability due to mental illnesses like schizophrenia (02-P) have just tickets cheaper by 50% of their normal cost. So PDD is in this case more privileged than, for example schizophrenia!

I do not function well in my life. I have never had a girlfriend, I would even said that I have never had a close friend (and practically feel no need of it despite having obvious sexual and romantic drive for opposite sex since being about 6 years old). I have never driven a car I have never flied in a plane and even I was not in country other than Poland in my life. I practically have no colleagues since above 13 years (and rather do not suffer due to it, although I like to write (for example posts) in the Internet). I had very poor occupational experience (I had only very simple jobs associated with leaflets with gaps from September 2017 to January 2019, my total time of having jobs is about 7 months, my first job was without any contract and was very short (about one hour just for 8 days) and second was due to my ruling of disability and lasted longer).

But I was pretty good in schools, quite often I had very good results (for example during written exams). I even have MSc degree, but I had studied not so "technical" subject and good memory for facts was useful during studies, I wrote theses about something associated with one of my "special" interests.