Hello, my name is Danny and i run a business called Webbro Web Designs, I am a freelance website designer from Surrey. I specialise in responsive CMS driven website design & development. The first answer shown on here provides a nice take on your question and he is absolutely right saying that around 35% of people browse the internet via mobile devices and this even increases at certain parts of the day.
After reading your question though, I thought i could add some value. I understand what you are saying and i have to say that responsive website design has many benefits, increasing SEO rankings and be able to connect with an ever growing audience however, there are some cases when it is not really needed.
In your CSS code you can add a min-width rule which will stop your container from collapsing below a certain width, this may be suitable for you as then none of the content on your website will get scaled and it will still be viewable enough on a external device with some zooming etc with your fingers, but still looking good.
It does take extra work to build a responsive website as you need to put i extra hours to code the css should change and adapt to the screen size, i usually find it takes around and extra day at the end of your project to make it responsive using a CSS framework like skeleton.css or bootstrap.
As you are not using your website for marketing and rely on SEO rankings inside search engines and only presenting this website to employers, I personally think you could get away with not having a responsive design, I would also say that by choosing one or the other, its not really going to effect your success in life unless you need your website to act as a salesman rather than a reference.
On the other hand it does only take around an extra 8 hours to do it all and is modern professional. I hope I have helped you in some way. Good luck