Oh, I've had that problem too!
I am afraid that if I write a replay, it will be misunderstood and sometimes I spend a lot of time choosing my words... The funny thing is that sometimes fears just come true. I had a few misunderstandings and had to explain myself 
The best of comments I had were when I didn't care much, I just had to say how I felt about a favourite comic I was reading, and after that I received likes of my own comments from different people for months!
I guess it was because I were true to my self and have stopped worrying. But I can relate to your fear. When I write something, I feel like blushing as if I am talking to a group of people and everyone will estimate me.