Some women consider it a dealbreaker for a man to have no friends, of course you should try to simply avoid these women but you'll surely encounter them once or twice if you were to pursue women in dating or have crushes.
They consider it a turn-off because they either believe the guy might become clingy (which you have just admitted to and proven you would become clingy to her if she was your girlfriend) or others believe you need a social outlet beyond your girlfriend.
Of course, not every guy with no friends will become clingy, I for a fact value both my solitude and social time and would just be happy knowing I had a girlfriend if I could spend at least one day a week in real life with her.
If there's any advice I could offer, it's that some people actually like to have a clingy partner, try to seek them out, try your best to meet new people and make new friends, if you can not do this then try your best to avoid becoming clingy in a relationship if she is the kind of woman who does not want this. Open communication about your needs vs. hers. You're an aspie, we tend to be open and honest so if she accepts you for your Asperger's then she'd appreciate honest communication as long as it's not overly offensive or insulting.
If my advice sounds too vague for you, to quote a post I made in a thread called 'Why don't people give real dating advice?' that said the only advice people ever give is too vague and not specific:
Quote:
No useful dating advice actually exists, aside from useless platitudes ("You just gotta put yourself out there again! You sound like a great guy! Good luck!) and generic Normie advice everyone already knows (Work on yourself, love yourself first, find clubs and groups with your interest, lift weights to get strong, etc.).
The only real factors that influence your chances are sub-conscious inherent biological preferences, certain psychological concepts such as Propinquity and Mere-Exposure Effect among others, and luck.
Anything else, such as 'Law of Attraction' or other rubbish is just pseudo-science.
So, at best, find what individually works for you.
How do you do this? I have no idea!
Find out! Find out what you need to do to find out what works for you. And find out what you need to do to find out what you need to do to find what works for you. And so on, and so forth until you come to an answer.