I get it, you're much more social than I am, but I'm afraid you're going to have to learn to be less social for the time being unless you can find good Muslims to hang out with.
It's still kufr.
He's not, she isn't Muslim, remember?
I'm pretty sure that's not true.
Because you don't know what nullifies one's Islam, so you need to learn about that topic in more detail.
From my experience, it tends to correlate. But don't worry, if you start following the right path, you'll eventually become much stronger.
So long as you practice Islam and believe in it, yes, it counts. Even if at first you feel a little weak in Iman, over time your Iman will increase insha'allah.
You think correctly.
The overwhelming majority of people are going to hell. But you've found Islam, so all you need to do now is make sure you remain a good Muslim until the day you day, and then you'll get into heaven.
That's a pretty major detail you should have mentioned earlier. If your father is Muslim, why aren't you asking him to support you? Why can't he take you to a Masjid? Why is he forcing you to live in an environment that doesn't cater to you? Why is he letting your mother act completely out of line by insulting Islam and forcing you to do haram things? Bring your issues up with him.
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That's even more embarrassing, you need to learn to become more self-sufficient. Heck, at your age you could get a job and earn enough income to live off of.