Notice a few things about the example you referred to:
- Shot at f/1.8, so about 2 stops faster than yours. This is a big difference
- Carefully aimed at the central part of the Milky Way; this is an area of very dense star population
- Shot in a very dark area (but does not mean you can't get something good under less-than-perfect skies)
The key, if you aren't able to track the movement of the stars with a telescope mount, is to gather as much light as possible in short exposure time you have before stars trail noticeably. You need to keep your exposure time below about 600/FL. So if you are shooting with a 50mm lens, about 600/50 = 12 seconds is the limit, perhaps a little more or less depending on your tolerance for trailing.
There are a few old threads around here somewhere that discuss techniques in detail. Some searching should bring them up.
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