Sex at 14 !?

So im 14 and my boyfriend is 17 i don't look nor act my age and maybe lots of teens my age say that but i truly do mean that but im unsure if i should have sex with him im a virgin and care about what happens with my body and i don't want to be known as the 14 year old who lost there virginity but i do have a sexual desire i guess with him i just don't know about it . so what should i do guys ?