Is my eyegl prescription severe?

I'm nearsighted and I'm -2.75. I'm 18, will my vision likely get worse by a lot or just by a little over time? My vision basically stabilized until I got a new computer and started going on it all the time, as using the computer so much made me more nearsighted by around -.5. I grew .5 in the last year because of my new computer and my addiction to it. NOw that I'll stop using the computer, will my vision likely get worse? Also, without my gles, I can read a book but can't really use a computer unless I'm up close. At this prescritption, when I'm outside, it's kind of blurry without gles but still good enough to see the general picture. A lot of detail is compromised though. So I just want to know is my vision seriously compromised at -2.75?