So I just got my good ol hands on 100MG Nic in PG, so i first figured out to get 3MG i have to use around 7.5 ML 100MG nic. So far so good, i decided to go under and use 5-6 ML 100MG, and then i started to pour in my VG after, but i really really feel i didn't even get over 150 ml juice in it.
Sorry man but I'm trying to make sense of what you're asking and failing so I'm going to break this down.
First off, you never said how much liquid you're trying to make. Based on a calculator telling you 7.5ml of 100mg/ml base, and based on your trying to get a resulting strength of 3mg/ml, you're trying to make 250ml total?
Based on your comment in this thread saying 190ml VG that's 76% VG if it's 250ml, otherwise I don't know what you're trying to do.
If you only made 150ml total using 5-6ml of 100mg/ml base that's 3.33-4mg/ml, so pretty close. If it really was closer to 250ml total then you're more like 2-2.4mg/ml.
You also don't even mention how much or which flavorings you're using, nor how much PG outside the nicotine base, so can't help you on that front, either.
then i started with my 20ml syringe and getting the pure VG in it.
The last time I've seen anyone competent advise a newbie to use syringes was about 2014; by weight is the way to go if at all possible.
Ideally you'll be starting with mixes at/under 250ml (and as a newb it'd be much better to only do 10-30ml at a time until you get a feel for things, less risk of waste if you mess something up), so you'd want something with 0.01g resolution up to 500g, plus dropper bottles or pipettes for the low-volume stuff (flavors/nic/PG if =<30%) and something more pourable for the high-volume stuff (VG, PG if >30%).
Is that not an option for you?
I poured in to a bit over the label, can anyone please confirm i did do it correct
Not sure what bottle you're talking about, but it sure doesn't sound like the label was intended to convey volumetric measurements - unless it does (or you already know its capacity from measuring it yourself) you really shouldn't just be mixing by eye.