Writing is just like talking. Just say what you think, as though you are speaking to a friend. The great thing about writing is, you get to go back and change something if you don't like it. You get to consider if what you have said makes sense. The key rule in writing is to say something that matters. Then, be honest. Don't worry about impressing people, or using fancy language. The best writing is clear and meaningful.
Everybody has to start somewhere. And we all feel vulnerable when we put something out. Try it. And if it doesn't work this time, try it again. Loving to write is a wonderful first step.
I wish you luck and hope to see a piece from you.
I'm a former teacher, so please forgive my coaxing tone :)