HOW MUCH can my insurance rate rise up after hitting another car? backing up i hit the front right bumper/ligh

I live in California and I have full coverage on my vehicle currently I am 26yrs old and have about 6 yrs with my Dirvers license and NO accidents or tickets on my record. BUT a lot of people mention that my insurance rates will go really high whn an accident happens. I hit the car behind me it donsnt seem to me a a major accident, but a small one. I need help just an advise to know what to expect, please!! maybe in an expert can advise.or other personal experience by someone?