What do I do ? Do I tell my secret ?

Im 15 and think im bi... My mum is an alcholic, family is messed up, some friends have said some stuff against bis/gay/s... I have never even kissed a girl, but just know that I like girls and boys. When im with my mates and were like 'hes hot' im also thinking the girl who just walked by is hot... What do I do ?? Can I tell people ?? Should I keep this a secret ??