It has become too much for me to handle...

I want to leave her, but my conscience keeps guilting me into not doing anything about the situation I'm in.  I have many reasons as to why I should leave her.  Reasons include the following:

1)  Constantly calling OUR child "hers" during the pregnancy.
2)  Breaking up with me during the pregnancy.
3)  Excluding me from her birthday activities/ the baby shower after having gotten back together (sure this isn't too serious, but I wanted to be a part of everything).
4)  Missing out on the birth of our child.
5)  Leaving my family and friends behind to move out to a completely new area where I know nobody.
6)  Slaving away at work for 50+ hours doing physical work, and coming home and being asked to do chores and such in my state of exhaustion.
7)  FORBIDDING ME FROM HANGING OUT WITH ANY OF MY GUY FRIENDS EVER! (she thinks they are bad influences on me, and she hasn't even met them ever!)
8)  Constantly bringing up ideas for the wedding, and saying she wants my opinions and ideas to be part of the wedding, but saying that all of my ideas and opinions are stupid. [i.e. she gets to choose what my tuxedo looks like, but I can't help her choose her dress].
9)  She wouldn't let me choose my own wedding band, where as she gets to choose her own wedding band!
10)  Trying to change my entire wardrobe [i.e. criticizing my old t-shirts, telling me to throw them away, and buying me completely new shirts that I probably will not wear ever...)
11)  Spending money that she doesn't have on extremely expensive items [i.e. her new camera for her photography business]
12)  Not wanting to leave her home town EVER!

And finally...

13)  Making me sleep in an entirely different room simply because she won't put up with my snoring... -.-

Those are only a few things of an outrageously long list of problems that I am having with being in this relationship / engagement with her.  And to top that, there are only a few things that are keeping me from leaving her.  Those things are as follows:

1)  Our son (I don't want him to grow up with parents who are separated)
2)  The fact that her photography business wouldn't make her enough money to help support her, our son, and help pay off her loans each month.

Yes, her photography business is slowly making its start, but it's not making enough at all to even cover ONE BILL per month!  And because I make close to 10 times more money than her each month, I am obligated to pay for everything...  I am getting so sick of being walked all over like a door matt, and yet, my conscience is playing soccer with my brain, saying "you have to do what's right; you can't leave her or she won't be able to support herself..."

I'm stuck between a rock and a hard place, and I just want out.  But I don't know how. :[ Save me, please?