Yeah, no. I really don't think you are an introvert. For starters you don't even really get a long with introverts. All the INTPs I know LOVE other INTPs. I do think you use your Ti more than other ENFJs, that I will definitely agree with. But, I don't think it's your primary function.
The fact that you would rather save yourself than others does NOT mean you aren't an Fe-dom. The people typing you seem to think all Fe users are illogical and have no value for their own lives. If this was true we would all be dead from rescuing squirrel's from being hit by cars. I know I would risk my own life for someone close to me, or maybe a child. But, my self-preservation instincts are pretty strong. While I think it is noble and heroic to risk your life saving others, I'm not sure I would do it for just anyone. Also, I told my mom once if I ever had to choose between saving one of my dogs vs. saving a stranger I would probably pick my dogs (I admit this may be a bit illogical).
All that to say, you can be a a selfish ENFJ.