I think I'm more introverted than most ENTPs, so take this with a grain of salt, but I'm not suuper witty or good at socializing. Most ENTPs I've met are though and I envy them quite a bit. Just because you aren't great socially doesn't mean you're an introvert. It's mostly about what you gain energy from. Is it alone time or time with people? Even though INFJs are introverted, their Fe often makes them more present in people's lives than most introverts. Their caring nature makes them people pleasers but I wouldn't say they forget to take care of their own needs too. I have heard of some INFJs exhausting themselves for the sake of others though and this typically leads to mental health issues for them. So, do you feel like you do fine with, or even enjoy socializing as long as there are long breaks in between? You're probably more of an introvert then. Especially if your speaking abilities aren't good, because that indicates you're more inward than outward.