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If the difference between a 13yo and a 16yo isn't significant, surely the difference between a 17 years and 364 days old person and an 18 years and 0 days old person is even more trivial. In life, you'll find that you rarely feel fundimentally different from how you did a few years ago, but you'll change a lot. And you aren't always the best judge of that change. That said, if you don't feel ready to engage in sexual activity, don't. Despite what some people will relentlessly tell you, there's no rush.
The law uses arbitrary lines, because it's impossible to capture and integrate the full complexity and range of human experiences in a way that can be applied practically. What's more, the capacity for consent is somewhat fluid, not just a property that a person always has or doesn't. There isn't a handheld device that can scan a person's brain tell everyone that the person can
If you say nothing about you has changed since you were 13, do you think there's going to be a big difference in the next 12 months, between now and when you turn 17?
Laws have to be written according to age, or else the government has to take on the cost of stringent tests. While a single age of consent is simplistic, "Romeo and Juliet laws" which give a little leeway among similar-aged parties are a sensible option >

Technically, my body hasn't changed much due to my medication. My puberty was held back until I was 14, so I'm not even that far into puberty myself I'm nearly 16 nut my body makes me look like a 12/13 year old instead of a 15/16 year old. >

Mental maturation is hormonally based. If you are blocking your hormones you are also blocking your mental maturation. You can’t assume the average mental ‘age’ of your peers as you have deviated from this.