It's certainly appropriate to do so. How much help he would be depends on what kind of person he is. Some dads have a hard time with daughters having sex, regardless of your sexual orientation. I would suggest talking to your dad but also looking around at other women in your life to see if there is anyone you feel comfortable enough with to bring up the topic. Teacher? Maybe but they have to worry about blow back from school admin. An aunt, older cousin, family friend. Although I'm not a lesbian, I can tell you that sexual frustration and zoning out thinking about someone you are attracted to is perfectly normal. If you are wondering if all you mentioned means you are, in fact, a lesbian or bi-sexual, then I'd say possibly - maybe probably - but girls usually go thru a stage where they are attracted to other girls. Don't feel you have to decide that right now. Just know that frustration and fantasizing are normal. As for protection - not sure where you'd put a condom if you were with a girl? I'd look on a medical website for the answer to that one. Dad probably has no idea, either. Good luck, sweetie!