popcorn ceiling in old building but ceiling looks new- asbestos worries
There's no way for anyone to say if there's asbestos in it by looking at it. You'd need to get it tested.

Is it a worry? Probably not. It's not friable in this state, so poses no real risk. It's only if you disturb it that it becomes an issue. For the amount you'd have to disturb to mount a projector I'd not lose sleep over it. If you must work with it a little bit, wet it down good before cutting/drilling (spray bottle--cuts down on dust), wear an appropriate mask (make sure it's asbestos rated), and get an appropriate filter for your shop-vac (also asbestos rated).