You don't need to know everything about UX design.
You don’t need to be a specialist in all possible verticals within User Experience Design.
A lot of people are starting in UX just now. The high level of attention our discipline has been getting, and the increasing awareness around the importance of designing intuitive, efficient, easy-to-use experiences, ended up bringing a wave of new professionals to UX Design in the last few years.
But UX is huge.
And it overlaps with a number of other disciplines.