Hello there community somewhat of a new user here...
I know I probably messed up some setting and, but whenever I extrude and scale vertices they move inwards of the model I dont know what I did or I am doing wrong but instead of going upwards they go up and inside the model... 
Any help is appreciated 

[![screenshot][1]][1]


  [1]: https://i.sstatic.net/CPTHU.png

[<img src="https://blend-exchange.giantcowfilms.com/embedImage.png?bid=8MKlrzxe" />](https://blend-exchange.giantcowfilms.com/b/8MKlrzxe/)