It really is pretty simple, if you don't identify with Ne+Te and how it manifests in the need to meet and engage people, then ENFP might not be your "area". This is what I call standing on two squares. You are the most introverted ENFP of all time but you don't identify with INFP. You are more introverted than the "plenty rare INFJs" you meet, but you don't identify with INFP. Excuse me if I'm not convinced...saying you are 4w5 is like saying you are 5w4, because there is very little that separates those two types. I have seen plenty of ENFP's claiming 5w4 as well, so it is nothing new. Your "adventure" buddy is a reluctant INFP 4w3? As a 4w5, I don't understand the term "adventure buddy"...maybe you could elaborate. The fact that you don't have 7 in your tri-type does not bode well for you being an ENFP.
So if I am reading this correctly, then you are an ENFP who finds excuses not to meet people or go places and is content to be reclusive indefinitely, and you don't have much use for a phone other than to charge it. You might also have a friend or two who you don't actually ever get to see and have no compunction to really change that situation, because you heavily enjoy all the accolades of being alone and somewhat isolated. In the end, it is all your INFP and INFJ friends that drag you, an ENFP kicking and screaming from your house and into the real world. I don't see it. If you are claiming ENFP, then that is the type whose descriptions you identify with, and they are quite different from Fi and Ni dominants (both introverts). If you have done the work with cognitive functions, then you will surely see why your Ne dominant preference manifests itself differently than those of Fi and Ni doms. Yours is an extroverted type, and as such, meeting and engaging people will be more of an impetus than Fi/Ni doms.
All that said, it is entirely possible that you might have a type of social anxiety disorder, which might be clouding your Enneagram/MBTI interface. If such a thing is indeed your case, then you have my apologies.