@Nick Gray I am in my late 20's, soon to be married (1 month away), work in a pretty decent IT position, and empathize with you...
Though I never thought I'd agree with @Thomas S. point of view above, I would say he is 100% correct. Then again, I could also argue that fighting the good fight, changing careers completely, might also very well be ok (perhaps a little instagram-ish/self-help-ish). Ultimately, it comes down to you.
I have always subscribed to the "use what you've got to work with" mindset. One thing I've realized over and over again: In the entry-level positions, you don't know what you don't know. Your degree and job in your field, while half the twenty-something-year-olds are out there are still "finding themselves" puts you lightyears ahead of your peers.
Your current job will open up faster than you anticipate. I speak from experience. Track you spending every month. Set savings goals. Make yourself more valuable to banks and investors.
Say you're a lender, and I approach you. Hi, I am in my mid-20's with an engineering degree, an engineering position, a steady income, a savings I have built up each month, and I would like some money to finance this REI deal please. Here are my numbers.
...versus...
Hi, I am in my mid-20's with an engineering degree. I left the field to pursue my passion in real estate. I have my new position at a real estate office. I would like some money to finance this REI deal please. Here are my numbers.
When both people walk into the bank or approach the investors (and believe me, they both do at the same time), who will they view as a sure bet? Lenders will neither care nor sympathize your move to pursue a 9-5 in RE out of passion. They will simply analyze you as a higher risk until you prove your tenure elsewhere.
I ended up keeping my position in IT. I had already passed the 2 year mark at my current employer, as well as received 3 promotions. If REI was the goal, I realized the banks would work with me if I showed less risk; greater job stability, being financially disciplined, etc.
They give more money to those who need it less.
Of course, at the end of the day, if you are patient and persistent, you'll ultimately get to where you want to go regardless.
Just my three cents. Good luck!