Why I can't do more than the bare minimum?

I am very self-disciplined and I do my study/work very well. However, I don't have big plans and dreams like my peers. I don't have long-term goals. I just want to make my miserable life as bearable as possible. When I had some dreams and goals, I was so emotionally invested that I was burnt out and I quit all those endeavours.

I write essays as a hobby, but I keep a low profile and I don't really want to become commercial and "sell" myself. These essays are quite inaccessible to most people. My cultural interests are very obscure and almost nobody reads the stuff I'm into anymore. I am averse to networking and I only care about genuine deep conversations.

Why I can't do more than the bare minimum?
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