You absolutely can go to Crossfit if you're out of shape. It requires a certain disregard for your social instincts, because you will feel out of place. While I was taking on-ramp classes (intro classes with more intense instruction and slightly easier workouts) I saw several extremely overweight people join up. I didn't see any of them more than a few times, but they were welcome and could have kept with it if they wanted to.
It's easy to feel self-conscious and unwelcome. Half the people in my on-ramp classes were in stellar shape already, and at least two of them were professional personal trainers who were interested in eventually becoming instructors. There were times when I was sure nobody else wanted me there, and I kept going just out of sheer bloody-mindedness, with a kind of "fuck 'em, I don't care, I'm going anyway" attitude. In retrospect, it was all in my mind. I never minded any of the people who were in worse shape than me. You won't be in anybody's way. And I would have said all that to someone who hadn't been doing "Starting Strength" for a few months, so it goes triple for you.
It's easy to feel self-conscious and unwelcome. Half the people in my on-ramp classes were in stellar shape already, and at least two of them were professional personal trainers who were interested in eventually becoming instructors. There were times when I was sure nobody else wanted me there, and I kept going just out of sheer bloody-mindedness, with a kind of "fuck 'em, I don't care, I'm going anyway" attitude. In retrospect, it was all in my mind. I never minded any of the people who were in worse shape than me. You won't be in anybody's way. And I would have said all that to someone who hadn't been doing "Starting Strength" for a few months, so it goes triple for you.