Every state has different laws for this, in North Carolina if the project is over $30k you must be licensed GC to do the project. I recently got myself into a little hot water with the state licensing board because I hired a GC to pull permits for 6 homes I built in last 18mo but I basically ran the jobs and paid the bills. While he was involved (his crew framed homes and he was at most every building inspection), I controlled everything. In this state, the GC has to actually run the job, contract with subs, and even run the money (pay the invoices). Luckily I had already passed my GC license when they came to investigate, but it delayed my license a few months and stopped me from starting anything new.
I believe in Florida (I left there 12yrs ago, so could be different) you can build your own home, but you might be limited to how often you can do this?
You can always partner with a GC and fund projects, or even better, get that license....