I need toughness.

Today quite a few people told me that I looked tired. Yes, they were right. I was (and am) very tired.

The only thing I want now is toughness. I'm easy to get tired from hard working, which certainly hampers my productivity in research. Some say toughness, rather than intelligence, is the most important thing to be a good researcher. I agree.

Now I start babbling. If I had a girlfriend, I would certainly get tougher. No doubt. The problem is that when I'm tired, I stop bothering to talk, and get very unfriendly and very unthoughtful. Obviously girls don't like such guys. I'm trapped.