So i have Serana turn me into a vampire to get me into the Soul Carin, and now no one at Dawnguard will talk to me. Is it possible still to complete the story line as a vampire now or do I have to cure myself to finish it for the Dawnguard side ?

gotta cure yourself no choice

Oh ok thats nice so I take one for the team and they kick me out. I didn't fancy being partial soultrapped. It sounded painful.

Hey at least there not filling you up with crossbow bolts.

i think the partial soul trap all it does is make it so you gotta go and find the gem with your soul in it or something while wandering around the SC

So yeah, cure yourself, beat the MQ, then if you want become a VL again and get rejected from the DG again xD

The soul capture nerfs your base stats by a little. Like 15 or 25%. Find the gem and you'll get that back.

I am talking from the perspective of my character as in RP. I did what she would of done if given the choice not because of the stats.

Alrighty.
I was responding to Xharon's post before mine. He said:
...which led me to believe that he wasn't aware of the stat hit you take...so I was being kind and clarifying.