Go for it, the only way is up!
If you research your subject, capture your method and your results then you have something that future you will thank you for, whether you share it or not.
Sleep on it for a few days and re-read what you put. Your unconscious mind will have processed it and have suggestions for improvements. Again, future you will thank you, especially if you use a spell checker.
If you do decide to share remember that there is always an audience of people who are beginning their careers so any article that gives them a leg up will be gratefully received.
The vast majority of feedback will be kind, criticism is generally constructive. If there are trolls, don't take it to heart. They are relatively rare.
Do not be dissuaded and judge yourself harshly because you have seen slick presentations at conferences where everything was sweetness and light. I saw an amazing presentation on personalisation where the vendor had delivered in record time a project that saved the company millions. Slight problem with the story, it wasn't true, not even close. I described the presentation to some people who had actually been on the project and they responded with some heavily industrial language.
All the best presenters at SQLBits started nervously. Martin Fowler from Thoughtworks came out publicly and said he was refraining from public speaking because he found it so stressful. Anyone who has heard Martin Fowler present would be aghast when they heard that. He was one of the most insightful and gifted presenters on the circuit.