I agree. I enjoy triathlon and enjoy swimming, biking, and running but if I'm not doing a HIM or IM I'm not training nearly as much. I have some sprint tris and gravel bike events this year so I'm at least maintaining some fitness but I'm just doing those for fun so no major competition goals. Somedays I workout hard other days it's more relaxed.

Personsally, I want it all.

I want:
An interesting and lucrative career
A world championship medal
Healthy, wealthy, well adjusted kids
Hot girl-friends
Travel
Interesting Hobbies
Good friends

I can, and I will have it all!!!!

Just not all at once.

Back to you:
Will you burn out?
Hell yes.
But why not.
That’s what life is for.
Just try not to do it before you achieve your main goals.

Maybe so, but I've seen people displaying this behavior before, and it very often ends up leading down a road that includes eating and depression issues as well. In fact, I'd be surprised if some sort of eating issue wasn't already in progress.

I would suggest scheduling time to wind down before bed. 7 hours is enough sleep for a 28 year old, but are your really getting a QUALITY 7 hours of sleep. That can be the difference between burning out and not. You need time to wind down after a workout in the evening. It's near impossible to leave the gym after 2 hours of working out and then expect your body to just slip right into REM sleep. Schedule some time after your workout to relax, read, hang out with friends. socialize etc etc. This is not wasted time, this helps your body prepare for the deep restful sleep it needs.

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Road Bikes, Tri Bikes, Mtn Bikes, I love biking!

Your body will eventually let you know if you're over doing it... Unfortunately when it does, you might never recover... That's the true definition of the loosely used term 'over-training'...