Hello and welcome to Iwaku!
You shouldn't be so down on yourself - everyone can improve their writing. Juku gave you some super links and I look forward to seeing you around!
The fact that you're here means that you like writing anyway, right? The love of writing out a story is the most important part here.
In addition to those resources, Iwaku has a lot to offer in roleplays and community and I hope you enjoy it here.
Take a look around the site and if you have any questions, don't hesitate to ask!
I'm Kitti, by the by, and it's good to meet you.