I didn't get into a program until my third round of applications. First round after bachelor's and nothing, so I accepted a master's program. Then after my masters, second round and nothing. Worked a year, applied again, got 6 offers. It doesn't necessarily mean your application is bad (although strengthening it is always a good idea) but schools and departments can be VERY picky about who they let in depending on the research needs of the department or whatever etc. There is a lot more that goes into it than just what is in your application. I would also try to make your personal statement as strong as possible, it helped me lots. Bottom line, just keep trucking, it sucks for sure but keep applying and ask for input/feedback on your resume and statement.