Dear friends i need ur help plz help me!!!!.......?

i m a muslim n hvng a boyfrnd we r tgthr for 4 yrs n i wnt t marry him my parents r ready but they wnt me to marry after 6 yrs as i m stding nw bt i m afrd tht i m dng a sin n i dnt wnt to leave him 2 so we decided to get register married without saying to any 1 n thn whn time will *** we will marry infrnt of our parents again plz help me am i doing the correct shud i do this