<human>: Can you succinctly summarize the text in 1-3 sentences?

I (male 18) made plans with some good friends of mine that I don't see terribly often and it has been about a month since the last time I saw them, I made these plans about a week ago and in that time my girlfriend (female 17) applied for a new job and got it, her first work day is today, and she is basically expecting me to cancel these plans to spend the night with her because it's the night of her first shift of her new job and she wants me to spend it with her..

I just want some external advice about what you would do if you were in my position. Is it unreasonable for me to miss a milestone like that? Keep in mind I was planning to see her tomorrow morning at the earliest.. She is relatively emotionally needy and I can see this is a big deal for her, but I can't see what's so difficult about waiting until tomorrow, I can't postpone this outing as this is the only break in work I have had in the last couple months.. help me guys, thank you.. I just want a third parties input, be as blunt as you like, we have been dating for three months.
<bot>: made plans with friends a week in advance, girlfriend wants me to bail to spend the night with her after her first shift of her new job.