Should I buy a primary residence or invest first?

[Adam Nash]

So far, I've always rented the apartments and homes I've lived in. Some of my goals for 2015 were to purchase my first home and begin my real estate investing career. I currently live in a house that is probably out of my price range to purchase. I am able to pay the rent because of roommate(s). However, I'd hate to have to downgrade when purchasing my first home. I would like to possibly continue renting and use profits from investments to some day be able to afford the larger down payment and PITI.

Any advice from people who have faced this scenario? What did you choose and why?