Thanks @umperfectpoet!
I think my tenses in writing are one of my worst habits!
I sometimes even miss them when I re-read (and probably do it while writing normally!) But you're completely right. I think it's because the story is set in first person too, which doesn't help me.
I will certainly keep an eye out on my tense now though (I don't think I need telling twice haha!) just getting through the rest of the first draft for now.
Thanks again for the constructive criticism. Not many people have the balls to these days. :P
All the best.