Plan on going. Make sure you sign up to the roll call and look for your sailing on other social media sites that cannot be mentioned by name.
Dont hesitate to mention that you are traveling solo, there may be others in the same situation.
Princess usually has a solo meetup posted the first evening/late afternoon. Look for it either on the app or their daily schedule that will be in your room. When I went on Ruby Princess they only listed it that first night,
If you see a meet and mingle, go to that. Also if you like to have a drink, sitting at the bar is better than sitting alone in a chair.
Then enjoy just doing what you want to do when you want to do it. Sleep in late, read a book, party your butt off.
you never know until you try.