That's insanely awesome. I totally feel for you. I was exactly like that.

It may seem difficult, but when I got to that point, I was able to push myself and keep going for 28 minutes. If you just focus and endure, you'll get a runner's high and go for a lot longer!
Of course, I've stopped running, so I probably can't anymore, but still! Just keep going and you'll be an amazing runner one day!