I think you should go talk to a therapist. There's nothing wrong with you but you may find that going to talk to a professional for a few sessions will help put things into perspective for you.

Also, don't trust randoms on the Internet but I will say from personal experience that the older you get, the less your body can withstand and also, some injuries you never fully recover from. You should consider what might be important to you when you are 40 or 50 or 60. What do you need to do now to make sure you're able to live like that then? It probably doesn't include some of the suggestions people are making in here.

A chart is only as wise as the chart maker.

What would 50 year old Endoftheline00 say to 35 year old Endoftheline00?

Thank you for looking forward to those next 15 years rather than backward at the last 15.

It's never too late to start because if you don't start then what else are you going to do?