Hi there jasonquadruple, and welcome to Scarleteen!
First of all, it's good to hear that your family is accepting of masturbation and has talked to you openly about it. It may be helpful to read our article about it- to help round out what you've already learned -
Is Masturbation Okay? Yep..
To respond to your question about this fear you're feeling about ejaculation, do you know where it came from? What exactly are you afraid of? I know you had mentioned that you were afraid of waking up after having a wet dream, but that you are no longer afraid of that. What do you think made that change happen?
Another thought I have is, is there a reason that you're pushing yourself towards overcoming this? Whenever people bring up fear or uneasiness about sexual activities or sexuality, it's usually an indicator that they may not feel ready to have sex, or that there are other emotional issues that may need to be addressed. What would it be like for you to try masturbating or feeling pleasure without trying to push yourself or work towards ejaculation as an endgoal?