By dedicating myself to the Epicurean lifestyle, that would mean that I couldn't lead deep and meaningful relations with people around me, simply because we would talk "on different pages".
I think you should be careful not to take that too far, in the spirit of the cliche of "not letting the perfect be the enemy of the good." Not many of us (maybe none of us?) have very many "classical Epicurean" friends in our personal local lives, but we can't let that stop us from developing deep and meaningful relations with those friends we do have.
This issue has honestly occupied my mind for some time now, and- just like with Stoicism-, that's a big "red flag" there. I couldn't find a solution to this problem yet, and I think that there isn't any.
The quote above doesn't make it clear but you're still talking about the issue of "how long do you have to live in order to live a full life?" I think it is important NOT to let this issue go, because it's closely related to the issue of how long we should desire to live, and it's clear that Epicurus said not to treat that question lightly. It does have an answer and we can figure out Epicurus' position if we think about it hard enough. If you want to create a separate thread on it, please do. In the meantime I will say that I think you are right to the extent that there is no one single number of years that is a minimum for which we can say "He didn't live XX years so he didnt have a happy or full life."