If you suspect celiac disease, then get tested for it, and also avoid all gluten.
If it turns out you only have a wheat allergy and still find it easier to avoid all gluten, then by all means, do that!
Gluten intolerance is an inexact term in my opinion.
Celiac disease is inherited. Health problems are triggered by eating gluten for those with celiac disease. There are several tests for this. Some people consider a stool test to be the most reliable.
Some people may not be able to eat gluten due to an allergy or similar condition. There are tests for this also, but they are not very accurate. The best way to know for sure is to cut out all gluten and see if you feel better.
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