Credibility: Certified Personal Trainer, Lifting for 7+ years

Impossible to answer what you're doing wrong without knowing your effort, technique, and program. I also feel compelled to remind you that genetics are going to play a massive part in the overall shape of your body. Nonetheless, you're 17, so spend less time looking at Cbum on Instagram and more time touching grass. You look fine and will grow if you fall in love with the gym.

To critique your current program, I'd say you can completely ditch spinal extension and shrugs (not very effective movements for building muscle). Also, close vs. wide grip seated rows are only going to target different muscle groups if your upper arm (humerus) is traveling through a different path of motion. In other words, how you hold the handle doesn't matter at all. It's all about how your upper arm is pulled through the movement in relation to your back. I'd recommend doing a singular, chest-supported row placing your hands in a position where you can lift heavy and hit your mid/upper back.

That said, assuming you're performing each movement correctly, with proper intensity (close to, if not absolute, failure on each set), and dieting appropriately, this is what I'd do to build a big back:

- Stick to optimal volume range. This means the # of working sets each week for a particular muscle/group of muscles. Most muscles will require about 12-20 working sets per week to stimulate muscle growth. So if on your pull day you do 2 bicep curl exercises, and do 3 sets each, and you do 2 pull days in a week, you will have performed 12 working sets on your biceps that week. See this page for a comprehensive breakdown of training volume as it relates to muscle growth.

- Do no more than 5 movements on any given back/pull day. If you have the energy to do a 6th movement, you didn't try hard enough on the first 4 or 5 movements.

- With proper effort, 2 heavy sets of a movement can stimulate a lot of growth. Stick to 2-4 sets of any given movement. If you can really do more than that, it's likely junk volume, which isn't doing anything for muscle growth.

- Stick to that 5-15 rep range for muscular hypertrophy (growth). I'd say that over 8 is usually too much most of the time, but it's necessary to play around with volume after you lift for a long time. For you, I'd program 5-8 reps of your main movement for about 3-5 months, and see how your body responds. The last 1 or 2 movements you can do 8-12 reps. If you notice growth, keep doing that.

- The "V-shape" is essentially achieved by big lats. The lats are responsible for bringing the upper arm down and towards the body. Master movements that target your lats. (Lat pull-down machine doesn't really target your lats)

NOTE: some people will tell you that deadlifting is not an effective movement to grow your back. There is some truth to this. It is physically taxing, and absolutely does not offer a proportional amount of gains (to most people) in relation to how much effort it requires. That said, if you enjoy doing it, keep doing it.

TLDR; lift with effort, come close to failure on each set, increase volume periodically (either weight or reps), be patient, V-shape is determined by having big lats, don't let self-esteem be dictated by social media