<human>: Can you condense the text into three sentences or less?

Since I was young, I've always dreamed of a small, intimate wedding on the beach with my family and closest friends. Now I have the opportunity to do so with a destination wedding in Cancun. Because I have a lot of extended family members (all of whom I had to invite due to the pressure from my mom), I hope the destination wedding would be some kind of selection: some people would be able to go, some wouldn't (who I will take out for dinner when I come back).

For my family, I am gonna pay for the flight, hotel, and every expense for my parents and little brother. Fiance is gonna do the same for his direct family. However, my mom expects us to pay for my extended family (5 aunts and uncles, not including cousins) to go to our wedding. Her reason: Fiance and I are rich and making a lot of money. 

Well, my fiancé has been working as a software engineer since he was 22, so he's been able to accumulate a lot. However, I am not. I just got out of my PhD program. Although I was able to land in a job that pays a little over 100 grands a year, I still have a lot of debts (college loans, credit cards debts, car payment, etc...) and have little money in my investment and retirement account. We are able to have the wedding because we decide to keep it small, and my fiance pays for the most parts. Why do we have a wedding when I am still broke? Because my fiancé has been waiting 6 years for this and insisted that we get married next year. 

So, how do I explain to my mom that although I make a lot of money, I am not able to pay for my extended family at my wedding?
<bot>: My mom is expecting me to pay for my extended family of 11 to go to my destination wedding in Cancun.