<human>: Can you summarize the given text in a few sentences?

Trying to be as simple as possible:

Started dating when we were both in college still. She cut hair for just over minimum wage, I worked at a gas station for just over minimum wage.

We moved in together with nothing but a mattress, two laptops, a tv, and a couple of junk dressers and desks three years ago.

She finished school and is now a nurse. I dropped out after being offered the job I was going to school to get (I'm a web developer). 
She's making about $60,000 a year. I'm salary at $65,000. We both have good health insurance through our jobs and 401k's.

We own a home together. It isn't anything fancy, probably $80,000 in equity, both drive decent cars, maybe $20,000 liquid assets. We have only joint accounts. Both names are on everything. 

No kids, don't plan on having any. Getting a vasectomy soon. Neither of our parents are overly well off, she has 2 siblings that she'll be splitting inheritance with, I have 5 siblings to split mine with. 

If we split everything 50/50 and walked away I think we'd be on pretty even ground, both of us are above national averages and could survive on our own comfortably. 

We're getting married in March. I don't really see a reason for having one, but everyone keeps telling me it's an absolute must. I'm pretty good at what I do, but I doubt I'll ever be Mark Zuckerburg or the like. She'll probably top out around $85,000 a year and I'll top out at $100,000 a year. Everything we'll ever have will be pretty evenly earned.
<bot>: Dating 4 years, started with nothing worked together to get to being reasonably well off. No huge income discrepancy, no kids, no huge assets on either side. Do I really need a prenup?