I suggest you buy a hardware wallet to store your coins. Maybe two if you need a hot wallet for quick transactions. If that's out of your budget, then use open source wallet as mentioned above and run it on a secure device. It might take some time and money to move and organize your funds by doing this but at least you are not depending on a software that may or may not has a backdoor. While Trustwallet has some good features for coins management, don't rely on them if your focus is security.