Is it wrong for a mature 14 year old and a inmature 17 year old to date?

We dont plan on having until a long time weve been dating for about 3 months tomarrow. is it also wrong for me to love him? i do love him. also my bestie that ive been friends with forever started crap bout me at school on the last day about me and my bf now everyone at school thinks im a slut wha tdo i do?