If you're driving 'normally'.. as you should be on any public roadway.. You're gonna be perfectly fine.
If you do want to open it up and find the limits of your car - and more importantly, the limits of you - in a safe(er) controlled environment, I highly recommend getting involved with your local SCCA or NASA chapter and start running a few local Autocross or HPDE events.
You will learn more about yourself as a driver and what the car will and won't do in one weekend than you have learned in your entire life driving public streets.
Especially since you said you're not a very experienced driver? You'll get one on one seat time with driving instructors that will show you what to do and what not to do. A lot of which is directly applicable to street driving like looking ahead (yeah, that seems obvious but I'll about guarantee you and 90% of people out there don't look ahead nearly far enough - trust me on this)... Making smooth controlled throttle and steering inputs... Learning how to place your vehicle exactly where you want it to be... How to induce, reduce, correct and control oversteer and understeer.
But mostly you'll learn how the car communicates with you and most importantly how to communicate back to the car. Then if you do ever need to make some sudden moves to avoid a potential accident, you'll be armed with some valuable tools and less likely to panic in a pressure situation.
I have a RWD Mustang that's far from stock. It puts out 520-ish horsepower and gearing to make the most of it. I've driven it in sun, rain, and snow - no issues. But, that's because I've learned by driving it competitively in a controlled environment just exactly what the car will and won't do.
And when some of us are talking about driving at the limit... I've spun my car off course and lost control of it more than once and if you get involved with performance driving you will too - and that's OK. How can you possibly know where your limits and the cars limits are if you don't ever cross the limit once or twice!
FR-S is a fun-as-hell platform.. Probably the best one to come out in it's price range in more than a decade... (1999 Miata and the S-2000 both come to mind). You SHOULD get it out and have some fun with it! It's a driver's car and begs to be at a track - go - learn - have fun - on the track, not on the public highway system.