I don't really approach much females myself. I'm capable of, but only want to approach if I'm 100% sure things are mutual, and there's been a few situations where I get female attention, but couldn't do it (wasn't attracted to them, was in a hurry, with family, already had a gf at the time, etc.)
All I can really say is, try not to overthink it.
Unfortuntely I disagree with the advice 'the worst that could happen is they say no'. Not at all - you could be called out as a creep, if she really wants to hurt you she'll report you for harassment, etc.
The key is to relax, dont think too much of it, etc. even just getting a number really doesn't mean anywhere near as much as one might think because even some women who act interested might give a fake number, etc.
There's no reason to be nervous and even if you are, just approach anyway. Even if you cant say a single word, just stand there and TRY to. If she hints uncomfortable or 'no' behavior at all, then just say 'sorry' and walk away, leave it at that. And try not to be guilty if you made her feel uncomfortable. Yes it's wrong if you did creep her out but she gets it all the time. At least you have the audacity to apologize, try to be sincere about it,
But really I suggest only approaching females in real life if its mutual..
This is my way of doing things and it works. it makes the job half as easy. You dnt have to 'impress' a female or 'earn' her attention.
Granted, you can definitely still stuff things up, very very badly in fact, but it's a lot harder to.
Also, a lot of other users here are finally starting to see what I've been saying for a bit now - that a lot of your posts darkphantomx1 definitely shouldn't be taken seriously I can see why you would troll for fun since you got banned from that bodybuilding forum and spend almost all of your time here.
BTW, off-topic but, have you still been studying at a university/college anywhere this year?