no unless you are taught proper form and don't over train
the problem with crossfit in your situation is i can imagine you going and doing clean and jerks and box jumps and really destroying your knees, elbows, back, shoulders etc cause you will want to keep up with others in the class
that is the problem with group workouts. so first LEARN how to do everything right and transition into it
it is no different then you showing up at my gym and working out with me, or going running with dylan. you will only do yourself harm