Remember that a big part about masturbating is not just the physical aspect of it, but also the mental part! Be sure to ~get your head in the game~ and focus your energy on your pleasure and the task at hand (pun SUPER intended). Also, perhaps try our a vibrator or a shower head to get straight to the point!
As for your second question, it varies for everyone! But it seems that a lot of people do struggle with orgasming at first, and I think a lot of it has to do with being obsessed with having a amazing, cinematic, screaming and moaning orgasm as an end result. Try not to put too much pressure on yourself, but just enjoy and ride and let your body lead the way!
1) Straddle pillow
To each their own! Just make sure that what you’re using/inserting in your body is safe.
Maybe! That was a big hint to me, lolz. But it doesn’t mean that for everybody. A lot of straight women seem to like watching girls in porn because it can be less aggressive and less gross than man+women porn. But use this as a starting point to explore your sexual orientation! Good luck!