Let's put a Ph.D into perspective.
Imagine a circle, that contains all of human knowledge:

By the time you finish elementary school, you know a little:

By the time you finish high-school, you know a bit more:

With a bachelor's degree, you gain a specialty:

A master's degree deepens that specialty:

Reading research papers takes you to the edge of human knowledge:

Once you're at the boundary, you focus:

You push at the boundary for a few years:

Until one day, the boundary gives way:

And, that dent you've made, is called a Ph.D:

Of course, the world looks different to you now:

So, don't forget the big picture:

Keep Pushing.