I'm telling you this because my father was the same way you are. he avoided going to the doctor at all and diagnosed himself.

He also smoked for 60 years. Yeah. He had his first heart attack in his 30s. Very avoidable. His second in his 40s. Then another in his 50s. Finally died of lung cancer in his 70s. Honestly a miracle he made it that far.

You can tell if you're feeling okay. But a lot of diseases have no symptoms. The reality is you cannot run your own blood tests. If you're young, maybe it's fine. But as you get older it no longer flies. What happens is you will become very sick, realize it's due to something like high blood pressure or diabetes, and you're WAY too far gone to fix it. The earlier you get on top of bad markers, the better. You don't want to live 30+ years with something like high blood pressure or high cholesterol.

Maybe you don't smoke (good for you), but that doesn't save you. Neither does living an active lifestyle. You can get high blood pressure, high cholesterol, diabetes, heart failure, etc regardless of your lifestyle. There're people who die MUCH younger than my father did while being much healthier.