The more self-sufficient you can be, the fewer societal resources you will take up, which could then go to someone else in greater need. That's my perspective at least.
But the more self-sufficient you are, the more resources of yourself you need to supply yourself. So you can provide less societal resources. If you do not need to provide clothes for yourself, you have more time caring for elderly, etc.
As another view, the total resources need does not directly change by changing who does what. The advantages of helping each other are in the OP. At some point however, I would think, the overhead of organization grows so large that it may not be worth it anymore. Just think of the amount of work put into "useless" administration in many countries. But in a 30 person village, this is probably negligible.
Edit: Thanks for helping other people on the feet!
I don't know your exact experiences, but I had a similar feeling in the past. However, recently I noticed it was a lot of how i behaved to them. I started speaking more openly with my male friends and noticed, they also value my emotions. The main difference was, that my friendships with women started on an emotional level making it a lot easier to open up for me. With my male friends, I needed to just say how i feel, which i have not dared for a long time. My own stereotypes probably played a larger role than the gender of the people involved.
However as others have said, if they do not take you seriously when you open up, they are bad friends. (Edit: Bad friends is a bit harsh, more like friends for having fun together, not to rely on. This is also nice even if it can be hard to accept)