Maybe a day late, but if we say that holidays travel with the sun, not against it, today is when Thanksgiving arrived in Europe... :-)
Thankfulness was not often my strong side. Only occasionally, for example when I was a kid I was afraid of getting my head under the water, and a slightly older pal coaxed me into learning it, and it turned out that swimming and frolicking underwater became one of my great joys. And I was so thankful to this guy that I told him I loved him until he got embarrassed.
But I'm learning, and I got much to be thankful for, and I'm also learning that it works in reverse too: being thankful provides more to be thankful for, so splurge on it. General thankfulness as a basis of one's outlook on life is a powerful foundation.
Oh, another thing I've learned is that this kind of thing, changing attitudes and thinking, are far from as easy as one would think, but one should not give up, because they change over time, not in quantum leaps.