We should not doubt about bitcoin investment because it will make you worried. It is good to think positive about the future happenings. Trust is important to have in order to be successful in your investment.
If you have confident in Bitcoin then there's no reason to have doubt to it but if not then don't invest yet. If you have believe in one thing especially if you know it has potential then, trust to that thing. Also like when you invest in Bitcoin, trusting to this coin is worth it so you don't need to worry because Bitcoin is one of the best coi to invest. But if you still doubt then don't invest, its better if you can take the risk without hesitation.