Bitcoin does not need trust. Its open source and so is the blockchain. You can verify everything for yourself, if you can understand it. If you cannot understand it then it might seem like an issue of trust to you.

As far as how secure Bitcoin is: Bitcoin is only as secure as the person holding the wallet. If you lose the key to your wallet or it gets somehow stolen or scammed from you, then that is 100% on you and chances are, you might not catch the criminal who did it. Although you might get your money back if centralized, non-self-custodial crypto exchanges catch him and freeze his stolen funds, because of your tip-off. But thats hoping for a dumb criminal, if you ask me.

Every investment has a scary first step but once you have made it, you need to hold on to your coin. Because the price fluctuations can scare you into selling for a loss. I do not recommend watching the price everyday.