Dating 4 months and have never been invited inside - this is weird right?

Update :(

Turns out, she's lives with her ex boyfriend. Cool.

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Original Post:

I have brought it up MANY times. I've picked her up in front of her house once. I've never been invited in, over, nothing. I think it's very strange. My friends think it's very strange. I'm not sure what to do. I can't force my way in (and don't want to obviously). I just don't understand. I'm at the point where if she doesn't invite me over/in very soon, I'm gonna have to end it because it's all just so f'n weird to me.

Tell me I'm not crazy and that this is not a normal thing after dating for 4 months. Or is it?