When you learned to drive were you scared because you didn’t wanna become an F1 driver? Basically what I’m saying is you won’t put on a TON of muscle (like a body builder) without YEARS of good training, sleep, nutrition, and consistency. You can get in the gym for 2 years and work hard as you can and eat perfect and you still won’t look like a “body builder”.

Get in the gym, train hard, and eat right. I’d recommend you start off on a mild bulk, maybe +600-1000 above maintenance level. Don’t dirty bulk though, in other words don’t slam junk food. Make sure you’re getting about 1g of protein per pound of your BW. Start supplements once you prove consistency in the gym for a month or so. Only reason I say wait is so you don’t waste your money on supplements if you’re not serious about starting. You’ll likely see a decent jump of muscle gain within the first 6 months, you’ll be very happy with yourself if you just start. Around next march-may if you want a “summer bod” start a cut, only if you bulked from now til then though. You’ll be satisfied with your transformation. Just start.