Admitting feelings to crush over text?

I'm debating messaging my crush and telling him how I feel. It seems a bit "bad" to do that just because it seems childish and some other reasons. I work with him and I find him very attractive, I have acted nicer than normal towards him but he probably doesnt know I like him because I'm gay but not out of the closet. He is also gay but out of the closet. I was going to tell him I person today but I couldn't muster up the courage, since I'm a very awkward and anxious person. I wanted to say "hey I find you very attractive, take that information as you will but please dont tell anyone since I'm not out of the closet". I'm not sure what to do, If I message him itll feel awkward and I'll be waiting on a response, and itll be easier, but in person I could see how he actually reacts. I'd also rather be denied in person than over a message but if it comes down to it I'll take the message. I dont know what to do and over been wanting to tell him how I feel since I started this job a few months ago.