I've recently made a grunge band with my friend, but I'm extremely concerned.

So recently I created a grunge band with my friend, and I've written a ton of songs and we've played them together over and over again but now I'm coming to a horrible realisation I am just another Nirvana knock off and it is completely pointless to do what I'm doing, this realisation has de motivated me from writing anymore as I want to become a big famous grunge band (Not gonna happen, I'm aware) but I just feel like my work is way too similar to Nirvana, and I don't know what to do. I just want other peoples thoughts on this and what I should do.

In conclusion: I write music too similar to Nirvana, and I feel like another lame Nirvana knock off, which will get me nowhere.