When I turned 18, I don't know if cellphones were a reasonable size, they had spotty coverage, and they were FAR from cheap!
When I was a little kid, radioshack had ONLY electronic supplies/parts, some kits, and some toys. Electronic supplies/parts does NOT mean radios, cameras, phones! It means resistors, capacitors, solder!
BTW MANY can't cook or drive, though they DO have a dirvers license. And you CAN'T "know how to use a cell phone"! EACH phone is a little different. SURE, there is a method to hangup, and a method to call. But FORGET about "knowing". Want an example? OK
My blackberry turns on by holding a button on the top left down for a time. My android, phone, one of maybe hundreds, turns on by touching a button on the upper sright side. My blackberry unlocks by hitting three buttons. My android unlocks by tracing up the middle of the touch screen, though I have seen androids where you have to trace down, or to the side.
And saving info is very different, and what they can save is different, etc...
You probably know the basics of sex. As for getting a woman? AH, there is the rub. It is certainly harder than simply getting a friend. But if you think that is EXPECTED when you become an adult, let alone demanded, it isn't.