1st time traving alone

So I have a cruise planned to Alaska for next week, and the friend that was joining on my just canceled on me and I won’t have time to find another travel partner.
Since I’ve already got the trip planned I was thinking of going alone. It would be my first large vacation alone. I am also just getting a bit of anxiety, I feel like a cruise isn’t something someone does alone and I’m not sure what to to
I will be cruising the inside passage of Alaska and am looking for suggestions of how to keep myself entertained on the cruise ship and out in the ports? I do have some things planned but I left alot open assuming my friend would want to pick a few things to do.

Do other people that cruise alone do much on the boat or do you take it as time to yourself? As a single male traveler is it easy to start talking with other travelers in this situation or is it weird to try and talk with people? What things do people like to talk about these days?

Overall im excited to try this new experience and then I can judge if I want to do it agian or not.

1st time traving alone