I think I'm wrong. You don't know where you're going cause the light hasn't left. but technically speaking FTL is impossible for various reasons. it breaks time travel and causality. But also any collision at speeds close to the speed of light would create nuclear fission or fusion. Check out this video as well from spacetime

https://www.youtube.com/watch?v=HUMGc8hEkpc

http://www.physicsmatt.com/blog/2016/8/25/why-ftl-implies-time-travel

I think you misunderstand what FTL means. If you travel faster than light, you already know where you’re going, because you are faster than the light is to get to you. You obviously would’t have any problems arriving somewhere where you already know where it is, because you saw the light from its past. The light that left there already reached you so you know exactly where you are going.

Like everyone said, that’s definitely not the top problem with FTL. It wouldn’t be in the top 100 issues with FTL travel. For instance: collisions with any particles. I recommend XKCD comic https://what-if.xkcd.com/1/