Is my bike OK to mountain bike with?

[Corey]

Just yesterday i bought a 2011 Diamondback Sorrento mountain bike. i am new to the sport, other than 2 trips around a very novice track at a local park. my dad has a diamondback bike, and he went mountain biking plenty of times with it. his was 700$ about 15 years ago. mine was about 330$. it has front shocks, and 21 gears. ive heard that diamondback makes very good bikes, which is why i bought this bike. my type of mountain biking would consist of dirt/mud trails down and up hill. also over small rocks(big enough to pick up and throw), over roots, and through small amounts of mud and thru shallow creeks. my bike doesnt have disk brakes or rear suspension. will this bike be safe/appropriate for moderately challenging trails? i was properly fitted for the bike also. im 6'1 and 200lbs. thank you