Nihilism is great. Nihilism is cool and sexy. But it isn't a philosophical dead end, as some people think. Instead, even if you believe in nothing, there are ways of getting at things that you believe in that can shed light on what your philosophy beyond nihilism is.
What particularly don't you believe in? For example, you don't believe in organized religion or Christianity. What exactly do you think is wrong with it? It's oppressive for the individual and has been a way of maintaining social control by elites for centuries. Ok, so you don't like the oppression of individuality and you don't like elites making and enforcing doctrines that keep people controlled. That means that you like individuality and that you want some sort of system where people in power don't have the opportunity to keep people in line with some sort of religion or ideology.
So right there you have two examples of some general things that you believe are good, things defined positively in the sense of "I generally like this idea", as opposed to negatively, which would be "I don't like this thing".
You can examine yourself and essentially look at what pisses you off to find out what you'd like to replace it with. You probably won't have specific answers to the questions of how exactly the stuff you'd like to replace it with, like individual freedom from social control, can manifest in the external world, but it's a step towards figuring out for yourself how that can be and then figuring out how to take steps to actualize it in reailty or to fight for some sort of change in society that accomplishes what you think is right.
This idea isn't new with me; it comes from Herbert Marcuse, radical theorist, who described a process like this in his book "One Dimensional Man", which is still in print.