Period skip for 1 month. By myself?

The last time I had my period was in Nov 11th and hence I expected the next cycle to be around Dec 11 th but it skipped and I did not get my period till now. My diet is good, no pregnancy/sex, but dontknow whats the problem. One doubt I have is I do masturbation sometimes which I think that may have caused this issue but somewhere I have read masturbation also doesn't cause this problem. I am tensed now because this never happened. Last year, once my period got skipped by a month and then I got it again after I had coconut water, papaya juice and all health remedies. Again from then My periods were on regular cycles. Again now I missed one month cycle. I have tried papaya juice last week. Got stomach pain and I expected I woukd get it but didnot get. Please help and let me know what would be the cause ? When can I get it ? Or suggest me if I should consult a doctor ? Or help me in taking any other health remedies by myself ? Please do help :) Thanks in Advance !!