I want to support her but...

My girlfriend came out to me as MtF transgendered recently. She's pre- all transitions, and I want to be there for her as much as possible. However, I'm starting to struggle in this relationship and I often feel like a babysitter when I'm with her romantically. I kind of want to break up with her, but at the same time I don't want to add to the stress of starting RLE and coming out to everyone with the devastation I know this breakup will cause. Also, the longer I delay this the more I'm leading her on and building up her expectations of this relationship. I tried really hard to be there for her but it's hard to be responsible for the happiness of both my partner and myself when I'm already struggling with social anxiety and depression.

I guess I'm just looking for advice here. Should I step out of this relationship I no longer feel I'm invested in for my sake, or should I stick it out and hope that I can learn to love her, and not the person she was before?
Any advice is greatly appreciated.