Should i support or ADC!!!!??

I love playing both support and adc. but the thing is I am not that good as adc and I wanna be good as adc. on the other hand whenever I play support with anyone they always say that I am a very good support and my few friends really like my blitz, thresh and alistar. I think I am good at tanky support. the only reason I played sup was because when I play norm games u can easily get in a team and start the match as u r most probably gonna be the guy they r waiting for. but as it turns out u can't carry as supp and have to rely on ur adc and others. I have been practicing adc for a while now and my fav is vayne. but I don't think i'm on a level to climb ladders with it. i wanna be good at one role supp or adc. so all i want to know is should i practice more and try to be good as adc or to increase my champ pool as supp and practice more. Do you think u can get out of bronze as supp??.........because from exp i don't think u can. thank you :) and sry for any mistakes in engish.