"Sexual addiction" is a term sometimes used to describe people who have lost control over their sexual behaviour and "act out" sexually in ways that are self-destructive and make them unhappy - using sex as if it was an addictive drug. So it doesn't sound as if this is very relevant to what you describe.
It also seems very unlikely that "sexual addiction" would make you attracted to a whole gender that you otherwise wouldn't be attracted to at all. So from what you say, it does sound to me as if you are attracted to some girls, even though you are shy and having trouble connecting with them emotionally (which is pretty usual when you start off in the wonderful world of relationships).
In addition, you have a crush on a guy. This could be a sign that you are also sexually attracted to guys (i.e. you are bisexual), but a crush can also be a primarily emotional attraction. Only you can tell if you're sexually attracted to this guy or think he's cool in other ways. You mention having had thoughts of guys sexually, but you also say you have a "lack of evidence of being sexually attracted to guys". The only evidence that matters is whether or not *you* feel sexually attracted to guys and want to have sex with them, and you're the only one who can know that.
Remember it's okay to be unsure about your orientation - you can always just wait and see who you are attracted to and want to be sexual with, without worrying about which gender they might be. Trying to "overcome" any of your feelings or treating them as "just an addiction" probably isn't going to help.
And the fact that your dad may be gay doesn't have any bearing on what *your* sexual orientation is.
[This message has been edited by logic_grrl (edited 05-27-2002).]