Kind of like being in a dark room with the lights on isn't it
Your little voice is trying to tell you something. My best guess is you're not diving in an environment similar to the one where you trained but I can't know for sure. Listen to the little voice and do some easy dives like the others suggested...dives that YOU feel are easy not dives that are easy for someone else. If you got certified locally then returning to the place where you certified to practice will help increase your confidence. Don't push your comfort envelope too fast, only change one thing at a time. If you're changing any sort of gear then dive a familiar site and only change one piece at a time. If you're changing sites then dive in gear you're intimately familiar with...if you don't feel intimately familiar with your gear then stay at the familiar site until you do. Oh and don't take the camera along on your first dive in a new environment, cameras are task loading and you don't need to deal with that right now.
Don't let your buddy talk you into a dive you're not comfortable doing no matter how much experience they have. Knowing you are the weakest link in a team means you need to make sure the other members dive to your comfort level. A good buddy will do this, any buddy who won't should be avoided. Dive accidents are a series of small issues that stack up and become overwhelming. "I'm not comfortable with this dive" is issue number one, you've started your accident stack and you haven't even gotten in the water yet.
Ber :lilbunny:

Don't let your buddy talk you into a dive you're not comfortable doing no matter how much experience they have. Knowing you are the weakest link in a team means you need to make sure the other members dive to your comfort level. A good buddy will do this, any buddy who won't should be avoided. Dive accidents are a series of small issues that stack up and become overwhelming. "I'm not comfortable with this dive" is issue number one, you've started your accident stack and you haven't even gotten in the water yet.
Ber :lilbunny: