Welcome Macaulay, welcome to the forum. 
I dare not to call you beeb davis, as it seem to be reserved for your gf only, jk
First of all, I want to tell you one thing, pheromone could help you only just about 10%, the rest is up to you. you can read What pheromones can do and what they cant Updated for more information.
Secondly, pheromone do work, but you have to know the dosage to get it work, you can read the How to find your sweet spot… to have the pheromone works on you.
Now come to the recommendation, for getting better your relationship with your gf, I would recommend IH, it deepen conversation and connection of closeness, she will open up to you more. and I would also recommend ammo instead of TUTH in your start up, ammo is the all time favourite, your girlfriend and people in general will find you more attractive, it is also known as mildly arousing.
The reason I recommended ammo over TUTH is that you can wear ammo anywhere, but TUTH can only be worn in sexual charged environment only. And at your age it is very easy to OD with TUTH.
Have fun bro!