Hey so this is all I can say really:
Thing is in life, we don't always get what you want and whilst there is the possibility of you getting hurt you need to learn to go into things head on and with a positive open mind. Its no use looking at every situation and thinking negatively, I get that you might not be able to help it I also tend to think of the worst case scenario which stays in my head really. Nevertheless I now don't let that dictate me and how I think about certain things. (referring to reason 3 btw) wouldn't say its rational but wouldn't say its irrational either. You just need to be positive about these things and focus on the now. Forget about what may happen in the future 1 week, 1 month from now or whatever just think about now and how that's going. If all is well then its a good sign and well ya know take it one day at a time. Everyone is scared of getting hurt sometimes, but honestly even if you do you'll eventually get over it. As well as its unlikely that it will happen. Give her a chance, you don't know that she'll hurt you. We're all vulnerable to getting hurt and life can f*** us up so bad but we just get on with it. You'll be fine! Just take it one step at a time.
I'm the same, but at the end of the day you need to know pretty much everyone feels the same way. So you are not alone. You'll breathe a sigh of relief once its all over. i would say this is a rational reason but do not let it stop you. This is just a barrier you need to break down. (1st reason). Just look at it as 'all the more reason to do it', to build up your confidence and what not. Start to believe in yourself and think about the whole 'what if' thing if you choose not to go through with it.Trust me the 'what if' feeling is not nice at all, leaves you regretting and wondering way to much so just do it and take whatever comes. I guess you'll just have to suck it up like we all do sometimes.
Rejection can go one of two ways, the two of you forget about it and remain friends; or she gets scared because you like her more than she thought you did and you'll no longer be friends but of course you could try to salvage the relationship. i will say from experience and observation about 95% you'll stay friends. Again a rational reason, most people feel the same but I doubt it'll have much impact on your relationship right now.
I think right now all I can say is you'll never know unless you try. Yes that's corny but its true and well if at first you don't succeed try, try again. Honestly there is no harm in trying
Just give it a go, I mean you'll realise its really nothing, it just the anticipation and all the possible outcomes that scare you. Other than that its all fine, and ya know what they say 'once you've done it once you can do it a million times!'
So yeah go for it
I'll try to elaborate some more, and give it some deeper thought though hopefully this'll be enough. Have to go to cadets so will help you more later
Sorry it took a while
Hope this helps anyways.