Based on the comments I want to make some clarifications.
To be self-reliant doesn't mean closing in on yourself and being unreceptive to the ideas of others. I read one comment that said: "You'll find yourself becoming a habitual contrarian for its own sake”. That is the opposite of being self-reliant, it's being conformist as you're reacting to others first and foremost, and not acting from within.
To be self-reliant means to be receptive to the ideas of others, just not dependent on them. You know your own truth as nobody else does. Often your own truth will appear from without, especially from the mouths of those close to you. But it is still your own truth.
To be self-reliant doesn’t mean living as a hermit in the forest either, that is a foolish conception of self-reliance. It means being inwardly independent, and is not mutually exclusive with cultivating a career or having a family. As Kipling said, it means “being your own man”, or to paraphrase Emerson, attaining the sweetness of independence in the midst of others.
Kierkegaard said "the inwardness of the existing person is the truth". When you understand that and live it, you have attained self-reliance.