Hello /fit/izen here. Unfortunately lifting did not cure my autism,

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Hello /fit/izen here. Unfortunately lifting did not cure my autism, so I'm gonna ask for some /adv/ice. I've had this female friend for around 3-4 years, she is very pretty and has had bad luck in her previous relationship with a guy that has been on and off. She dosent talk alot about it but I feel very sad for her not finding a man that can be honest and take good care of her. Latley during summer she has been spending alot of time with me and our other close friends. Not really alot of time alone together. But when were alone there is a kind of tension. I think she wants me and I want her aswell. Now that you know a little back story. My question is how do I turn this friendship into a relationship with intamacy and feelings, commitment to each other?
I do not want to fuck up my friendship, but I'm prepared that it will have an impact of this turns out bad.