Would it be wrong to chose another trip over the other?

So this summer my friends have planned trips. One is a graduation trip. But she hasn’t shown for my birthday the past two years. Not counting but my family has been there. I can’t afford to go on both trips. But I feel bad picking one over the other. The other trip hasn’t been planned to capacity yet but I don’t want to commit to one and then it ends up happening. Would I be wrong not to go on my friends grad trip?
Would it be wrong to chose another trip over the other?
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