Hey Muffinz,
To keep this as short and sweet as I can.
Do what you do to find yourself as long as it doesn't harm anybody - which from what you said, seems harmless so it's all good!
Keep your actions to yourself if you are surrounded with people who may be toxic (your sisters spreading rumours). You can open up to people who you can trust to respect your behaviour. To non furries, this appears like you are searching for yourself, (or those who really don't understand may think you are just disturbed) because they honestly don't understand why you would identify as something that they see as unnatural.
Also, if you don't act suspicious about it, ie closing tabs and what not - it doesn't look like something that needs looking into (unless your mom would go into your business regardless).
And the sexual confusion, during puberty you go through so many hormonal changes that it's crazy! This is probably the weirdest time in anybody's life. If you're flooded with emotion and what not, try to use logic, that usually would help me go through that time as well. Think of the consequences to your actions before you go with anything. And if you experiment, USE PROTECTION!!
The good thing about puberty (and anything really) is that it doesn't last forever. By around 19-20 maybe a bit over, you will stabilize and look back to your teens and laugh. It's a confusing time but that's because you have so many hormones, man, you can't even control it.
And if you are a female in real life, then scientifically you are attracted to females as well. I forget if they found an evolutionary reason behind it but they ran experiments to see what turns on the genders with various sexual orientations and discovered women to be attracted to women. Including those who identified as straight and reported to not be attracted to women (either disconnected from their body and its arousal or maybe just hiding a secret
)
Anyway, teens are hard, it'll get better. Especially if you can get yourself a good job and move out. That is if you're done school, don't ditch school unless you have a business strategy that you're willing to commit to.
Seriously, good luck