I have a really flat nose. It looks so weird and I hate it. Once I even heard people making comments about it. Are there any exercises I can do to make it pointier. (I know its not in my genes since no one related to me has the same problem)

There's nothing you can do to change the shape or size of your nose other then surgery.

No one has the nose,
Weather you think it is big, small, pointy, or just ugly.
I have never heard of exercies sorry.
Just ignore the people who have time to make comments, they are probably insecure themselves.

Remember it is mind over matter, you don't mind, and they don't matter ;)
Im sure your nose is perfect the way it is!

I'm sorry to say that the only way to change the shape of your nose is by surgery, but I don't suggest that you get surgery.
If people start to insult you on the way your nose is shaped just try not to show that their comments are hurtful to you. By doing this they will leave you alone.
I know that this is easier said then done, but it will benefit you not just by driving those mean people away, but it will also boost your self-confidence :)
Oh and I think most people would prefer a flat nose rather then a massive pointy nose, so be proud :D

It's not possible to exercise your nose.