Maaaaaan, I so left a reply on this thread hours ago... but stoopid forum and computer were being stoopid and acting up.
So... again!
You said you were going to side with the ISFP's on the matter. But really, we only have the experience of knowing you via this forum. A lot of ISFP's can be quite outspoken and chatty on forums. I often am. And honestly, I can be pretty chatty in person, too. But, I lean towards not wanting the spotlight, towards introverting my thoughts, opinions, feelings, and towards wanting solitude to ponder. I don't mind being alone or when things are quiet and also, I don't require a lot of stimulation.
I once had a friend who swore he was an ISFP. But, I could tell he used more Te than I did, and I used more Ni than he did, which was one of the signs. He was definitely an ESFP, but had a hard time seeing himself as more of an extrovert than introvert. He was a fairly calm, non-boisterous ESFP type, but ESFP none-the-less. He had a stronger desire to be around others than I did, and did less introspecting than I did.
So, yeah, not all ESFP's are loud mouthed party goers and not all ISFP's are quiet mice.
Also, you had a video on your page before... and you looked like an ENFP. Ya know... ENFP's generally have a very distinguishable style... and you sort of fit that bill. At least in that video. Hey, maybe we need more marmie videos?