How do I find my own artistic voice?

I have a theatre background and have been doing stand-up comedy for a little over a year now. Since I am just starting out, sometimes I get huge laughs and sometimes I get no laughs. I am struggling, because sometimes I watch the more experienced comics and I think I should be doing what THEY’RE doing. But, really I need to experiment and try to find my own artistic voice. How do I do this??