Should I tell my manager that I have autism?

So I just got a job at McDonald's. I finished on boarding, and online training. I start hands on training tonight. Well, I have autism. I can appear stand offish, and quiet. Also I have trouble processing things, and I have to ask questions more than most people. The manager so far has been very nice to me, but as I was doing online training in the break room, I could hear him interacting with employees on the floor, and he's pretty abrupt, and a no nonsense kind of guy. I already told the interviewer that I have a lot of trouble with math, and counting money, but im not sure if the manager knows. I just know im going to be a slower learner, and I kinda want him to know why, and hopefully be patient with me. Although I know it could really backfire. What should I do? Just keep quiet, or speak up?

Should I tell my manager that I have autism?
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