Welcome Alex!
It happens to us all, I still get AA when doing direct approaches, things I found helped was going out with the intention of TALKING TO EVERYONE, just get used to talking to strangers, you'll find most people are polite at the very least.
I also did a few days as a charity fundraiser, where you've no choice but to approach person after person after person, many of whom will be rude, cold and downright disrespectful, but hey, if they wont donate, the next person you ask might, its the same with chicks, you wont find all are open to you or attracted etc, but oh well, there's someone who will.
another thing that helped me was the rejection challenge, go out AIMING to get blown out, you set it up as a win - win, you either get rejected (desired goal, so its a positive thing, not a negative one) or you'll actually end up approaching someone who's really open and receptive to you, where you can number close, now you have another lead to follow up!
I'd recommend working on your fundamentals too! your posture is really important, since I started working on these I've noticed a drastic increase in IOI's and girls making the bold move and opening me! this is THE MOST IMPORTANT PART dude!
Day game is a my preference, it's easier believe it or not, no one expects it, you catch girls with their guard down, deliver a sincere compliment and almost everyone will be somewhat warm to you!
JUST HAVE FUN WITH IT! at first, I was shitting myself, now, I actually wake up on days off excited to go out there and practice my game, I get a buzz from it, it's the best fun I've had in a long time and I can't figure out why i was so afraid to do it before!
Where about's in the UK are you? I'm in North London and have only recently moved here, are you local?