tl;dr New girlfriend, first since TRP, still insecure about my body, don't know how to deal with comfort tests, going to be sleeping in the same bed in 3 weeks, no clue what to do

Typical story, super beta dad, extreme alpha mum, blahblahblah. Recently discovered TRP, found that a lot resonated with me and I connected to the idea well. I feel like the pill is in my mouth but I haven't yet swallowed it.

I've been focusing hugely on myself recently and applying trp to my lifestyle, but haven't looked at TRP in relationships (aside from the sidebar material).

Found this girl, I've known her for a few weeks, we got together recently and we've established that we're a 'thing.' We're both 17, I have super lenient parents but hers are pretty strict Catholics.

She's beautiful, small and submissive etc, and I set a frame from the beginning that I'm dominant and she's responding very well. I'm pretty decent with shit tests (so far) so that doesn't worry. The main issue is I still have a few insecurities, still got the chubby torso (not noticeable until my clothes come off) and have little to no direct experience once clothes do come off. It's like I know how I should be acting as the dominant one, but it feels incredibly unnatural and I spend too much time thinking about what I should be doing/saying. FYI, we have the same social circle so I can guarantee that whatever happens between us in the future will spread quickly.

In her (and everyone else's) view I have a higher SMV, more money, grades, freedom, good looks, which means she's piling the comfort tests on, eg 'so are you just going to break up with me in a few days once you're bored with me?' and 'god knows how someone with your brains and looks is with someone like me.' I have no idea how to actually answer this kind of thing, it's very new to me.

In 3 weeks we're both going to a party (never been to one before) where we'll be staying over, most likely in the same bed. This is probably the part that worries me the most; my body is in a much better state than a year ago but I'm still insecure, especially when she has an incredibly athletic body (whilst I have the facial looks).

I really just need advice and help here, I'm still inexperienced about this kind of thing. If anyone is able to talk more about this (whatsapp, kik, snapchat etc) please let me know.

Thank you TRP.