Uploading Another's Experience

Did you know you can look like you are having the best time of your life,
Then shed your happy demeanor the second you step into a bathroom stall and breathe a painful sigh of relief to finally cry from all the pain you feel but can't show on your face...

If you could extract someone else's memories, can you feel all of the pain and they concern they experience during a moment that appears to be nothing but pure joy?

I mean, when I am on the lake in my kayak, 90% of what I feel is nothing but relaxation, appreciation, and joy. Complete joy.
In my mind, however, I am noticing that the pain in my back is worsening and that I cannot keep my legs in their current position. I am thinking about how I can paddle more easily without causing my to my shoulders. I am examining the distance between where I am sitting and how much effort it will take me to paddle back to the dock... I have to gauge how much farther I can go without being completely incapable of getting back.
I am thinking about how much more often I would love to do this. I am thinking about how I used to be able to carry my own kayak and lift it onto my own vehicle and go kayaking by myself - but that now I have to rely on someone else to do all of that. All that I can do without worsening my pain is sit and paddle on a quiet lake.
I am hoping the wind doesn't pick up.
I am thinking about all of the other activities I have 'lost' the ability to do and hope like hell I will still always be able to kayak. I watch the sky and the birds and the water and love every single second of being out there. I also think about how it might 'look' to be kayaking when I am too ill to do much of anything else. I worry about someone taking a photo and claiming that it is 'proof' or even evidence that I *might* be faking being ill. That if someone sees my smile, they will say that I look too happy to be in pain. I worry about rumours. I worry that they can't see the physical strain on my expression. I think about the cramp in my legs, in the unwanted curve of my spine that makes me slouch, in the rising exhaustion of my muscles. I am calculating how long it might take me to get to shore if I need the washroom in a hurry - so I feel the temperature of the water just in case I have to jump in, in case of an emergency. I imagine what it would be like to add a waste disposal unit in a kayak itself. I think about how I would love a GoPro just so that I can share the beauty of nature that I get to see. I think about taking photos so that I never forget that I was once able to kayak - when I eventually lose the ability. I think about how I wish Dex could come kayaking with me - how he might handle it. I think about how I'd live to surprise RJ with a kayak so that we can go together.

If someone else could instantly feel everything that I feel while I am doing something I thoroughly enjoy, maybe they would understand a little bit more.

If we could actually upload someone else's full personal experience - from a 'perfect' Instagram photo or a 'perfect' picture of a couple... empathy wouldn't be such a difficult concept.