Anyone who has experienced a crash, whether pilot error or equipment failure, is bound to nervous of crashing again. It's in the nature. I've had two major crashes in my time...one was pilot error and one was a fault with the aircraft. This was a few years ago using Phantom platforms. Both times I was nervous on my first flights after the respective crashes. I could do something about the 'pilot error' crash by simply not making the mistake I made again but the second crash wasn't pilot error. I couldn't do anything to avoid that crash and if whatever caused that crash was to happen again I still wouldn't be able to mitigate against it.
So it is that I don't trust any drone 100%. All I can do is try and cover all eventualities the best I can and treat my aircraft with the utmost respect. So, only continued use of your aircraft without further incident will help you reduce your fear. But having said that I believe it is healthy to have at least a small mistrust in your drone. They are complicated things and things can go wrong but, hopefully, not too often.
In a way, flying over a deserted beach or the sea is probably less dangerous than flying in land: If it does go down you are far less likely to injure someone and it's that what matters. You can replace your drone but it's difficult to resurrect the dead.
The only way to overcome your fear is to get out and fly. Mitigate all you can against any mishaps. Maintain your aircraft to a high standard and make sure your piloting skills are polished. Choose your flying areas with care and follow the rules. I can't guarantee that you won't crash again just the same as I can't guarantee that I won't crash again. Just make sure that if you do crash again you won't injure anyone. Your drone is just a thing that can be replaced. Now fly it.