Propranolol

so I’ve been prescribed propranolol for anxiety and I currently only take them when I’m about to do something that makes me anxious or if I’m randomly anxious. This is currently not often due to the fact I currently do nothing, stay in my room on Xbox or pc. My questions is should I carry on only taking as and when I need or start taking regularly. If yes why and what’s your experience with them?  

Thanks guys.