<human>: I was just hanging out with my girlfriend reading, and she was being particularly cuddly.  When all the sudden she says "If you'd like to, I want to have sex with you."

Now, I almost drop my book and start feeling really giddy (I don't know if it was good or bad giddy) and stare off into space for a while.  It was only several minutes later when all I could think to say was "I really don't know what to say..."

She told me it's okay and not to think into it too much, or something similar.  But I can't help it.

This probably wouldn't be a big issue with most guys and gals in a relationship because sex tends to be the standard of what they do these days.  Most people seem to *want* to loose their virginity as soon as they can.

But I'm, admittedly, scared.  I'm near 21 and she's 20 and this is my first real relationship, so everything has been really new to me.  We've been going out for a bit more than 6months already and so we've had a chance to talk about sex before.

When we did, we sort of decided we weren't really going to... at least not for a good while.  This I think was partly because of nerves or personality on her part, she wouldn't say much about why rather than she didn't want to have to worry about it.   And I had my reasons for not doing it too.  Apart from moral ground I have built up discouraging me from just having sex willy-nilly, I don't want it to end up being a mistake...

The big reason I'm afraid it could be a mistake is because of a situation with my dad, where when he was young he moved fast with a girl, they had married and had a child.  And now I have a sort of estranged half-sister.

I'm not entirely sure what I'm trying to get across at this point anymore, but I need to get this off my chest and talk it out.

Give me a shortened version of the text
<bot>: (at request of mods):  Girlfriend(we're both 20) of 6mo decides she's ready for sex, I feel conflicted about this, don't know what do.