You should create this package under your own folder, not in github.com/inancgumus/learngo folder. Also, please note that VS Code may automatically import my library which is in github.com/inancgumus/learngo instead of your own library.
So, if you want VSCode automatically import your own package when you save, just move github.com/inancgumus/learngo out of GOPATH to somewhere else, for example, to your Desktop (of course move it back afterward).