There's a very specific part of the brain responsible for the movement planning and fine motor control required for writing. Some folks have it underdeveloped, and need to spend an inordinate amount of effort and concentration in order to write. And even then, their writing will often degrade over time as they fatigue.
Oook, but is that the case with the OP or is it an excuse? Handwriting does require a bit of practice (children usually do it for a few years to get good).
I can say that in my case my 6th grade teacher started paying close attention and noticed that when I was trying my hardest to be neat I was doing like my peer at their worst. He had the school counselors do some tests which didn't result in anything other that agreement that I have an inability to write neat.
I first head about Dysgraphia 10 right here though - the symptoms a familiar enough for a self-diagnosis, but as all self-diagnosis there might be something else.
My teachers noticed it in the 3rd grade. I was able to write cursive, but it took me far longer. The result of this is me using a device called an Alphasmart (they stopped making them a couple of years go), through the rest of my education.
There's a very specific part of the brain responsible for the movement planning and fine motor control required for writing. Some folks have it underdeveloped, and need to spend an inordinate amount of effort and concentration in order to write. And even then, their writing will often degrade over time as they fatigue.