Where or hiw do you find nice people that can give feedback of your work?

This. I'm trying really harder to connect with people to talk about technologies and how to achieve things. I send emails all days and I'm starting to think that this is impssible. Nobody seems wanting to spend a couple of minutes reviewing code from someone inexpert like me.

What can i do to improve?

Check out https://codereview.stackexchange.com/ or the code review subreddits. If you follow their posting guidelines you're likely to get feedback on how to improve your (working) code.

I recommend you start with the free options above, but if you need more in-depth feedback we offer paid code review at https://www.pullrequest.com. It's code review as a service for every popular language that can help you improve your code quality.