It depends. If you want to receive treatments or participate in programs that can help with some of your issues, then you will probably need an official diagnosis to receive any of this help, as it will probably be paid for either by the government or by an insurance company. Before they will pay for it, they will want to know that you have the condition for which you are seeking help.
In my case I am too old for the children's programs, I am not attending school or university, so I don't need the school programs, I am not interested in socializing, so I don't need the social programs for adults, and I am disabled due to other health issues, and unable to work any more, so I don't need the programs that help with employment. Since I don't need any of these programs, I haven't bothered with an official diagnosis. Based on my own research, I have no doubts that I have Asperger's Syndrome. I follow the rule of duck: If it looks like a duck, walks like a duck, and quacks like a duck, it's a duck. I am an Aspie duck.
In your case, you mention wanting help, so I think you would benefit from an official diagnosis.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau