Is it safe to have safe sex at 13?

Probably not: Sex is complicated. At 13 there is no way someone is mature enough to engage in it properly and responsibly. You have the rest of your life to have sex.

Unsafe sex at 13: It might be emotionally damaging to the 13 year old to have sex at such a young age. It is unlikely that a true emotional relationship would be in existence which is healthy; safe sex is more than just not becoming pregnant; the emotional state pre and post of the partners must be considered.

Sex at 13: Sex at 13 is frought with potential for mental and physical harm (such as STD's pregnancy, etc.)

Wait: Once you lose your virginity you can not get it back. You need to grow up some so that you know the physical and emotional issues related to sex. Despite your assessment of yourself, you are exposing yourself to abuse. Talk to your parents, a clergy or an older female you can trust. Get HPV vaccine. Wish you good health and good sense!