Good luck, RandomGuy. Sexuality is astonishing; the amount of stuff human beings have figured out to do to get a sexual charge would fill a whole set of encyclopedias. Consider that anything you do that does not hurt another human being, is acceptable and is human. And keep in mind that this time of your life, the main hallmark is change. Be allowing to yourself, try not to be down on yourself. Surviving being 15 is a super accomplishment altogether! (As a friend of mine once told my husband who was going to run a marathon -- "If you don't get passed at the 20-mile point by someone juggling bowling balls, congratulations! You win!") Try to see sexuality with the same kind of relaxed allowance, and you'll get stuck less and will come out OK. :)
Thank you for the advice.
As far as getting excited about women's clothes is concerned, a lot of guys who are somewhat fetishistic about women's clothing are straight guys, they just happen to find women's clothing erotic, and have transferred their erotic fixation to themselves and the clothing, together. Whether it will stay with you or fade away as you grow into adult relationships with women, kind of remains to be seen. But please give yourself a bye, if thoughts like this go through your mind. Let them, they might take on less importance over time or might not, but try to see the whole mental image as one of those things that sexuality does. In other words, try not to be down on yourself about the fantasy; humans are quite sexual beings and fire up to all kinds of stimulus.
As for self-esteem, there are very few teenagers in the world who could honestly say this is NOT an issue for them. It's such a changing time, the brain is changing and the hormones are acting on the emotions -- best thing to do to lift your spirits is exercise, and taking care of yourself.
Good luck! Try to relax and count this as something that might go by, but if it does not, that is not a big deal either.