I do not like some thing in Apple Music and I would like to tell them about this. How can I share this to other people and in same time inform Apple about this?
You could submit an issue to "Apple Bug Reporter"
Even though it's called "Bug Reporter" you can also use it to submit enhancements, suggestions, feature requests, UI/usability issues, etc.
To sign in you need an Apple ID which you probably have anyway.
In a way you also "share this to other people" in this way, because if other people submit similar issues to Bug Reporter it can be linked to your issue, so that they know someone else reported something similar already.
Apple Music does not yet have a "feedback page" but you could try to use the iPhone or iPad feedback or iTunes feedback pages since Music is integrated into the whole ecosystem. Each of the pages says that they read all the feedback. Go to the main feedback page and choose the product that you are primarily using Music with and submit your feedback there.