You'll be dead a long time. When they stick you in the ground, that's it. This is your life and it's ending one day at a time. Life is too short to feel trapped.
The only thing that keeps me, is my decent salary. But for some reason, i can't see myself dragging anymore for another 20 years.
These sentences really jumped out at me. It might be decent but it's not making you happy. Doesn't that say it all. I don't have specific advice but go and find something you enjoy, life is too short.
I was deeply unhappy at a former employer and I got stuck in the same faulty thinking loop as you. I thought I could just go in and punch the clock and go home and that work and personal life were two unconnected things. They weren't. That type of discontent seeps in to your private life and the onset is insidious so you may not even know it or be able to self identify it. I changed to an employer and a company culture that was a polar opposite and I noticed a huge change in my personality, behaviour and outlook on life.
I had a moment of realisation one day when a friend snapped at me and told me that my constant complaining about my former employer showed a lack of character and to either shut up and get on with it or do something and change my situation. Sounds blindingly obvious but most common sense is just that.
As for job security and comfort. Those are illusions. There were a lot of people in comfortable and safe jobs prior to COVID that were driving delivery vans in quite short time frames.