Don´t worry, if you fall in love you fall in love. My brother is bisexual. He has been married to a woman and have kids. When he is singel he dates both men and women. He hasn´t really been in a long term relationship with a man though (at least not yet).
My neigbour is a lesbian and she is married (to a woman) and have two kids and lives a completely normal suburban family life.
You can choose whatever you want :-)