My pen handwriting is terrible, but I like brush handwriting! I want to ask if I can practice calligraphy well.

Theoretically, it is possible. Because it has nothing to do with whether you can learn Chinese calligraphy well or not. The ancient Chinese calligraphy was not good ~O(∩_∩)O~ If you really like it, don't doubt your ability unless you try. No one in this world has the right to say "you can't do it". Only when you have tried and worked hard will you know if you are good at it. So, don't doubt yourself, come on ~! PS: I like calligraphy, too ~ I've been writing about Facebook, and I want to change my style recently. I am a girl and want to write soft articles. Hehe, beside the point.