My boyfriend don't want to mentally disturb his parents for his love

hi. m 21 yrs nd my bf is also 21.. we both cant leave without each other bt his parents is little bit mean minded.. they told my boyfrnd intercaste marrige we never accept.. nd my bf is too much affraid that wat shud he can do coz there parents mentality he cant change bt in same line he cant leave without me... nd m soo much affraid of him coz he is so much irritate nd tensed... he is study engg. n m affraid of his future.. plz tel sumthing hw to convey his parents