unsure to go on holiday w friend help

Hey! So me and my friend met at sort of apprentics around coming up to almost two years ago, I love her to bits we've never really argued. We both work away from home and are quite young ( 20) so our friendship is that of a more sister bond rather than friends as we live together and look out for each other. We openly cry to one another, offload and we have both helped each other through personal issues whilst being away from home.
Long story short we've been mentioning the subject of a holiday fro around a couple months now sayingg wed love to go ... and genuinely I would. However its got to the time to start booking it now and tis all just kind of overwhelmed me to the point im not actually sure I want to go.
There's a couple things in which is holding me back. For a start were both students ( she has a job outside of the apprentiship) I dont. and the budget side of things are sort of hard. WHilse I do have the money its clear she's looking for a bit more of a spendy holiday and when I mentioned to her yesterfday im on a budget and maybe look somewhere cheaper she was so fine about it and claims that she's happy to go with me .
Also im just recently going through a big breakup around 3 months ago and still very much heartbroken. Im very anxious about the summer and just not sure if a holiday is sort of 'what I need' right now - I know that sounds silly as it sounds like the perfect distraction but I dont know I get quite anxious about these kinds of things.
ive spoken to my parents who are 50/50 sort of your young so dont even overthink it and do it, but also there is just SOMETHING holding me back and they're like its quite a bit of money if your not 100% .
Was just looking for some advice really.