I think I might be sort of 'internally stubborn' - this is kind of related to what PG wrote, about:
ENFPs can sometimes become stubborn when their integrity or ethics are questioned
In my case it is more like when someone is asking me or pushing me to do something that I feel would make me compromise my values, I'll dig my heels in hard. And my wife says I have a lot of patience to be able to do research, because so often nothing works and nothing works and nothing works, but I still chisel away at it. I'd call it stubbornness instead or patience (or maybe tenacity, if I'm being generous with myself).
But I'm not 'externally stubborn'. I usually won't argue at all; I won't even start. And if I get stuck in the middle of something that's more or less inconsequential, I'll just agree, or switch position at some point in the conversation. Arguing never seems worth it to me; I sort of feel like its not a very effective method of trying to change peoples' minds, and I don't really enjoy it for its own sake.
Mostly because it sounds a lot like me as a teenager.
Me too! I was a lot more like that when I was a little younger. Now I've made so many mistakes about so many things that I've gotten a lot of practice at admitting they were mistakes =P