I think many of us find ourselves in this confusion ;)
If you can't figure out your top two functions, maybe you can figure out which you suck more at: Fe or Si?
Some of what you wrote makes you sound less comfortable with Fe. Particularly the feeling bad for letting too much of yourself out.
One other thing I've noticed is ENTPs are more likely to try to bring their ideas to life (think mad scientist, entrepreneurs, etc) INTPs tend to settle for the ideas being in our heads. I had an ENTP roommate and his 'experiments' would scare me sometimes. (Weak Si - means inability to sense the danger, strong Ne wanting to see what happens) Ne, being extroverted, wants to effect the real world. Strong Ti puts a damper on this.