Hi Leonard - Welcome to Pherotalk. 
Yup, there are a lot of scam/poor products out there and we have almost all been suckered to some degree - don’t worry, at least you learned and moved-on!
As you are 18, you will probably be producing a good amount of androstenone yourself and the girls around your age will probably be at their most sensitive to it - Our output falls as we age, whilst womens sensitivity rises (generally).
So for starters, I would certainly suggest you look at Ammo, which contains none but is well balanced by the other two main pheros, for a good all round social/sexual attractant. You will need to test carefully to find your best dose, so have a look at this thread which contains all the info to get you started:
However, you should also look at the socials - Instant Shine, IO, IH and IG. Although they are called social, they are very important in triggering attraction and especially so in younger women.
IS - is a happy and good to be around mix
IO - Promotes flowing conversation
IH - helps bonding and closeness
IG - Is a light but smooth/suave status impression.
And as these are not none-based, you can do a lot more with doses at your age.