uni at 21 mature student advice needed!

So at 18 i applyed and was accepted to study pharmacy at Brighton Uni, even though i only got BBC at A level (they asked for BBA) which was great. It was deferred entry and in the meantime i am travelling (where i am at the moment) however i now realise i want to travel and do casual jobs and see the world for longer (another 2years). So the question is do you think if i pull out now and reapplyed when i am 21 will i still get in? Will my A levels be worth anything when they are 3yrs old? Will i have to do an acess course? Should i just go to uni now (bear in mind its a 5yr course). would travelling, life experience and learning a new language give me any benefits? So any advice in regards to my situation would be helpful.