Yes, luck in the sense of happiness is a state of mind. No, luck doesn’t make a person better than others. It makes life better for himself. Having been so lucky as I tried to explain makes me fortunate. Part of it (having the luck to get education, jobs, more opportunities in life) made me materially fortunate/rich, another part (opportunities to be happy) immaterially. If you want to express it in that way — having fun is fun. My point is that education increased my chances of a happy and lucky life. I am not saying that uneducated people can’t be happy or lucky.