I'll echo what Key said: A HUGE percentage of the world's population has H. pylori; most people are infected in childhood or adolescence.
Ordinarily, health care providers will not test for H. pylori unless you're having symptoms. My husband was having GI symptoms several years ago. He tested positive for H. pylori and took the antibiotic treatment -- with no trouble at all, you should know. (He was eventually diagnosed with IBS, which has nothing to do with H. pylori; but they had to rule H. pylori out.) Because the spouses/partners of people with H. pylori are highly likely to be infected, I asked my primary care doc if I should be tested. He said no, not, unless you're having symptoms.
So Key is right: Having H. pylori is no reason to worry. It *very slightly* raises the risk of stomach cancer, but it's so slight that it takes an army of statisticians with supercomputers (I exaggerate, but only a little) to find the increased risk. And: Having it may protect you against acid reflux/GERD.
Nature works in fascinating ways: There are very few things that are all good or all bad. Most things carry both risks and benefits. Of course, those of with HA tend to focus only on the risks, even when they are very, very tiny!