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My first instinct was to panic that I would lose friendships and lose the care I get from my family and friends.
Exploring this fear might put you at ease. Perhaps it's not being a child that you seek, but having too many connections. A partner would make it difficult to keep the connections you prefer. It sounds like a relationship would require all your energy, which you instead spread out among friends and family.
It also sounds like your fear has more to do with having a relationship, and all the things you don't like about them. There's nothing wrong with feeling that way, or preferring your friendships and family connections. Do people put pressure on you to find a boyfriend, or is this just your own fear?
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Would missing my female friends if I were in a relationship make me a lesbian rather than an asexual?
No, because you're not drawn to them erotically or romantically.