I'm in exactly the same unaccompanied "boat" except I've just booked my second cruise, first on SS, immediately after finishing my first, on Ponant.
I don't wish to be viewed as a 'solo' or a 'single' traveller; I'm just a passenger who happens to be unaccompanied. Treat me like a member of a couple whose other half happens not to be with them right now.
I had a delightful first cruise, unaccompanied. Dined, mixed and was accepted when I wanted, tootled off by myself when I wanted. As when I did land tours by myself, I met and engaged a lot more with other people then when I've travelled with friends.
You'll be fine, we'll be fine π.