is it supposed to be sharp when coming out of the gums though?
The edges can be a bit sharp, yes, as they're not smoothed down by use yet.
Also, since yours are coming in on the bottom, you may find them more uncomfortable. You don't really have a gap where they are, and they come right through the gums which normally hug your older teeth.
On the top row they can be easier, since you often have a nice space between your backmost teeth and the gum at the back of your mouth.
They can come in as early as 15, and they can take a long time too.
I had mine start at the age of 17, but only on the top row. I am now 19 and they still aren't fully developed. I have no sign of the ones on the bottom row.
Luckily mine don't cause me any pain or discomfort.
Make sure to keep good dental hygiene with them, as they're new and not always as strong.
They can go bad with a lot of people because they can be prone to a rapid tooth decay with poor hygiene.
Here's some good advice regarding Wisdom Teeth and their removal (which isn't always necessary).
