WHen I was younger, I could entertain myself without even needing friends. In fact, I spent most of my childhood and teenage years without having friends or even missing having them. However, after some time I lost many of my interests, became more hyperactive and also self-aware about my lack of social skills (undoubtedly the result of my preference for solitude). Nowadays, I spend more time searching for things to do than doing them, but when I do find an interest, it keeps me entertained for some weeks.
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DISCLAIMER: It should be noted that, while I strongly suspect I have Asperger's syndrome, I am not diagnosed. Nevertheless, my score on RAADS-R is 186, which makes me a pretty RAAD guy.
Sorry for this terrible joke, by the way.