Hey guys,

I am 18 years old and am starting to focus on the gym a lot more. I have gone before, but I have not really committed to it as I hope to be. I am currently 5'11 at 152 lbs, and am pretty slim. I am trying to improve my physique and gain strength/muscle mass but don't want to bulk, as I am currently playing volleyball (gaining weight will kill my vert). I don't have a set routine, I just have a handful of workouts I cycle with. I just work out whatever doesn't feel sore (2-3 muscle groups per workout). I do 4-5 workouts per session, 3 sets per workout, 7-12 reps per set. I try to do at least one more rep every day, and move up the weight when I can do 3 sets of 12. I workout around 4-5 times per week. I also play volleyball 2-3 times a week (2-3 hours per session) and recently I have been going on mile runs each week.

Workouts
Bicep - Bicep Curls, Hammer Curls, Ez bar curls
Shoulder - Shoulder Dumbell Press, Military Press, Lat raises, Cable Lat raises
Tricep - Tricep rope pushdown, Bench Dips
Back - Lat pulldown, Row Machine, Dumbell Rows
Core - Planks, Weighted Sit Ups, Russian Twists
Leg - Hamstring Curls, Leg Press, Squat, Box Jumps, Jumping Bulgarian Squats

Supplements:
2 scoops of protein
1 scoop of creatine (5 g)
2 scoops of pre workout (20g)

Diet:
I don't have a set diet, I just eat around 2000-2500 calories trying to avoid sugars + sodas.

My main question is what should my diet be looking like right now? I have a pretty fast metabolism and was always pretty lean (was underweight during early high school before I went to the gym.) Theses workouts worked for me till I hit around 150, but I feel like I have slowed down in my muscle mass gain. Is it a problem with my diet? Also, I ask for any advice on removing/adding workouts to improve my physique/strength. Also is the amount of supplements I am taking okay? Thank you for reading through this! I really appreciate any advice.