This probably impacts most graduate students! Is anyone natural at this? I don't think so!
Here are some practical tips for getting to learning to write well and perhaps even come to enjoy it. I'm a convert myself. I dreaded it but now enjoy it. I never thought that was possible! But, of course, it takes years.
First, read scholarly articles. Lots of them. Select classics (ask your adviser for well known authors or pick ones that ...
How to go from hating the writing to having it flow -- no magic, just good habits. This will give you some insights.