I’ve lost interest in everything I’ve always loved doing. What can I do?

I especially feel this way when I’m dating people. It drains me so much.
Just earlier today I decided I don’t love horseback riding anymore and planned to sell my horse. I mean, that’s not exactly something I would ever do, because riding has always been my biggest passion.
I also don’t want to really go to the gym, even though I always enjoy working out.
I feel really hollow and empty, and I don’t look forward to nearly anything. I’m only 25 but feel like the rest of life is just about marriage and kids. I know marriage isn’t for me and I can’t have kids outside of that.
Im not sure how to push past this empty feeling. I considered giving my horse back to his previous owner and then using my board money I’d pay monthly towards improving my appearance (implants, Botox, filler, etc)
I’ve lost interest in everything I’ve always loved doing. What can I do?
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