I have one red bump in my neck and i did anal sex before month and half is that mean i get hiv i did hiv test after 5 days and it was non reactive als?

Not necessarily: Get a HIV nucleic acid test, if the result is negative, repeat the test in 6 months. If you intend to continue having sex with men, talk to your doctor about taking pre-exposure prophylaxis. consult this site for information: https://www.aids.gov/hiv-aids-basics/prevention/reduce-your-risk/pre-exposure-prophylaxis/index.html

May not be HIV: You're going to need to see your physician and get retested again. You should not do unprotected anal sex. A Red bump may just be a staph infection. You need to see your physician for that.