I think you're 7, but apparently that's impossible since 7s have to be an Ep type
I don't see why that has to be so, but that's a discussion for another place.
Se in itself is not only about gathering sensory experience, it's also about territory, force and power. I haven't seen anyone here discuss that aspect of it, and I haven't seen you mention anything about it either. How do you assert your opinion on others? Se is prone to blunt forcing it. And Se *will* have opinions at the ready due to the fact that every piece of information they gather gets processed with a judging function afterward.
As for seriousness being deep, it doesn't necessarily have to be so. I think beta NFs are "deep" like that but they are also less serious than gammas. I should clarify what I understand as serious: prone to disregarding the joking or fleeting aspect of a statement and considering it as a full representation of what the person means. To me, what is being said is what the person means; crude beta humor is insulting to me. In SEE and ESI, weak Ne; a failure to consider anything that's not an obvious joke as a joking statement, and taking it as a representation of someone's Fi values. It ends up looking "serious", even if they do crack jokes or are stereotypically fun.