Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I have already a web application with this url
is it possible to have mysite on differet web application but following url?
Yes it's possible.
In fact it's generally recommended to use a seperate web app for my sites as it's common for this to end up being mysite for multiple web applications.
For more information see: Plan for My Sites and Set up My Sites
Required, but never shown