I am not young, Alex, but I do know the fear facing you.
My husband was diagnosed 16 years ago....but he is active, plays bowl and snooker, is out at his ukelele club at the moment.
Yes, life has changed, holidays are different...no hiring a car and whizzing round America, Greece etc.
Diet is a pain...keeping protein away from meds, taking pills every 2 hours..having spells of depression and exhaustion.
BUT, loving , happy times with family, meals out with friends, trips to the theatre and the cinema...are all part of his life.
Life changes slowly, you will adapt as and when you need to, you can cry when you want to....loss is always hard to adjust to.
New drugs and treatments are in the pipeline...my guess is that within 10 years this disease will be able to be stopped in its tracks and reversed.
I hope young PWP will post and reassure you.
You will cope with this and have a good life to be lived.