I'm going to chime to ask if you really want roommates . . . if you are really sure you do, then your plan for a bigger house is fine. If you are 100% extroverted, it might even help you to have company all the time. Find out your extroverted/introverted ratio here:
https://www.16personalities.com/free-personality-testBut roommates can be a pain. They can be inconsiderate. They can be hard to evict if they end up down on their luck and can't pay their share of the rent. They can do things like buy pets without asking you first, then let them pee all over the place, use your laundry soap and never buy any, make lots of noise when you are trying to sleep, bring over guests who you don't like, etc. And sometimes this situation ends up really bad with people who you thought were your friends prior to the landlord-tenant relationship you are contemplating. They can be the worst roommates, actually. It's a much more awkward situation if they live in the same house as you do than if they live in a separate property that you own.
Personally, since this is a "what would you do" thread, back when I was single, if I had come into that amount of money, I would have bought a nice small house or townhouse using part of the money for a down payment and invested the rest. A 2 bedroom if I could find one I liked close to work or the center of town. I would say even a 1 bedroom, but this can be hard to find in some areas except in apartment style high rise condo bldgs, and I prefer a small yard or at least a patio. Plus, I don't like having people living above me. A smaller place gives the joys of home ownership and room for a future significant other without having a mortgage so big that I am forced to rent to other people.
Check out Herbert Derp's frugal adventures thread here on MMM to see how a young person owning a small condo can grow a stash at an alarming rate via regular investing in the stock market.