To know whether you actually have a shot or not, more details would be needed, and even then it would be hard to say for sure! Such a low GPA is a big flag though that your physics understanding may not be strong enough for graduate work. However, there could be lots of reasons why your GPA is so low but you could still have a strong understanding of physics (for example, learning disabilities that makes you do badly on tests but still know the concepts). Grad school is more than just GPA though, so a strong research record and GRE scores could help too. But maybe you don't want to share these things with strangers -- if not, you could also try talking to a faculty member at your school that you do feel comfortable talking to. I found that I received a lot of useful grad school guidance from the faculty!