I can see why you'd type yourself that way.

However, my belief is that almost any E7 will become a chronic whining bitch when they aren't having their needs met. It's not a side of me I'm proud of, but I am self-aware enough to realize that when my needs aren't being met it's going to irritate me to no end until they're fulfilled so then all of the "fun E7 things" I want to do go as perfectly as I dream them to.
And in this regard, as I learn more about the Enneagram and its instincts, I'm starting to realize that sp is less about worrying about those needs as their own entity and is actually more concerned with one's sense of autonomy and self-sufficiency (I know [MENTION=6561]OrangeAppled[/MENTION] and [MENTION=5871]Southern Kross[/MENTION] discuss this a lot. I know both [MENTION=4945]EJCC[/MENTION] and I were talking about what it was like to be sp-last and I remember that a common point we resonated on was that "my friends take care of me more than I do for myself" which I think is actually one of the fears/embarrassments we feel as an sp-last type - being an eternal child always being parented rather than growing up hehe (this shows up differently in her than me though because of the ESTJ 1 flavoring).
I also think that being 7w8 over 7w6 would make you even more of a go-getter and more concerned with your sense of autonomy so that could also add to it. But just from my POV you seem very easygoing and warm for an 8-influenced sp-dom which is why I'm questioning it here in this thread. sp-doms strike me as a little more guarded and cut off because of their desire for self-sufficiency and independence. You have to work harder to earn their trust, while on the other hand an so/sx might be out there proactively engaging others more and becoming everyone's best friend which is what I see you doing a lot even if you're not aware of it.

Well this rings true for so/sx types too (probably even more so than an sp/sx).
Like EJCC said, I would definitely not call the so instinct a team player. It can present itself in that way a lot of the time (especially in ExFx types who kind of go hand-in-hand with the so/sx type). The so instinct definitely involves an awareness of your surroundings. A social-last, like I've seen EJCC and OrangeAppled talk about I think, tends to move in the room more like they're invisible. Not saying being social-last makes people be like YOLO fuck the haters, but they tend to just kinda act as if no one was paying attention to them in the first place. I think the sp-last type is more the kind to go "whatever, fuck it" and do their crazy thing because they already
know it's silly.
I think social-doms have a desire for connection and interaction possibly even more so than how the sx-instinct is described (@Hive can check me on this haha). The way you go and put yourself out there and engage people and just seem to want everyone to be happy and get along is what got me thinking so/sx. Yeah being an ENTP and E7 will also make you outgoing but I think you're strangely smiley, happy, and just an all around chill dude for a 7w8 sp/sx. You'd be a lot more combative and biting imo if you were that type.
(I also just got back from an intervention about my friend being sent to the hospital so sorry if some parts don't sound coherent haha)