I am 31 and just had mine done in December. My arthritis developed over the years after I had a traumatic posterior dislocation when I was playing football at age 12.
I remember feeling all the things you are feeling. In the weeks leading up, I wanted moments of clarity when I would do an activity, and just think, "man, I just can't do that anymore because of the pain" or "wow, I am just not the person I used to be". These moments were what pushed me through the doubts. I knew if I had a successful surgery, my life would be better. I would be able to be more active with my 4 young kids. I would enjoy the next 20-30 years of my life without pain.
I am almost 5 months out, and I am so glad I did it. I am not back to where I want to be. I still have muscle weakness in my quads and hip that are getting stronger, but no joint pain. Good luck, I look forward to hearing about your post-op journey.