Stimming by itself is not Asperger's. Each person with Asperger's and other Autism spectrum disorders has a group of traits that are common to people on the spectrum. No one person has all of the traits, and each has their collection in varying intensities. If you suspect that you may have an Autism spectrum disorder, go into the General Autism forum here on WP. There is at least one post there with links to online tests you can take to figure out if you are on the spectrum. If you test out as being on the spectrum, save the results of your tests, and print out several copies--one for your own records, and one or two to take to psych docs for an evaluation, if you want or need one. If you do go for an evaluation, make sure you go to a doc who has experience with Autism spectrum disorders.
As other posters have said though, you could have one of several other conditions instead, though.
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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