Hi Canyoufelix,
So sorry to hear you are feeling a bit down about it all now but glad you have found this site, it really is a wonderful place to get advice and support from other people who know what you are going through and just 'get' it.
I got PA at about 19 but it took about 5 years and a hip op before I was properly diagnosed. Getting it young definitely doesn't mean you are going to crumble a way early, although sometimes it may feel like that. It's pretty unpredictable as a disease - it can be active for ages and then just fade into the background for a while. I honestly also think that the doctors make a real effort with young people, they seem extra determined to stop us getting joint damage. It may make your life bit different - but that won't always be a bad thing. I've met some great people and had some wonderful experiences partly because I have PA. Sometimes it will be totally rubbish, you miss out on stuff or get annoyed that it limits you but that's when you can come on here and have a good old rant. I totally agree with Niceman and FF that what we discuss on here is more the lows than the highs so don't let us worry you too much

I think it's ok to have some time feeling sorry for yourself and scared - it would be a bit more scary if you didn't. It took me a long time to accept I was ill and even longer to accept some of the help around. I found sharing some of the leaflets on PA with family, friends and work did help them understand a bit better and let me share my worries so maybe that's worth a try?
Hope some of that waffle is helpful and keep us posted on how you are getting on.