I'd like to add to Moon's statement just a bit.
We cannot give quest hints/spoilers in this forum. It is not allowed. That includes information on what quest paths lock out other quest paths.
HOWEVER (and this is what Moon was referencing; Xillix has covered the topic too) I can tell you that in the future faction points will play a much larger part in quest access, so it would be wise to plan ahead and refrain from taking actions in quests that do not reflect your character's personality.
That being said, I think it would be perfectly reasonable for you to make a petition so that a GM can check you for any known quest bugs.