I think as long as you get your message across, that's good enough. Nobody's perfect anyways. But if you use the language more often (not only in writing but also in speaking) you will get better at it. Reading also helps a lot. Don't be disheartened by the negative comments. There are more people who loves what you do though they may not say it out loud. (I think that includes me? *blush*) If you need help just ask. I'd be happy to edit your work for you. =)