I had sex with a boy from years ago not protected sex and he might of had an std and now i been for the 2 days or 3 days after i been burning before during and after i urninte not sure if it is a health concern due to maybe becoming a prediabetic???

You may just have a urinary tract infection. Get evaluated and treaten before it gets worse.

You have mentioned at least three issues: 1. STD, 2. Urinary infection 3 Pre-diabetes. It would be prudent to see a primary care provider for an assessment. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health.