Lots of good advice by people here, except the pick-up artist stuff. Pickup tactics only work for very charismatic men. The rest look fake and desperate. Fake and desperate is not attractive.

You say you're old... but not how old.

If you're over 30 and still having trouble with this, I think it may be time to admit that you have some serious social anxiety problems (or maybe you're in the asperger's spectrum, which presents its own unique challenges), in which case, perhaps some work with a therapist who specializes in this kind of thing is what you really need.

You say that girls rarely approach you. Is that really a surprise? People rarely approach random strangers for no good reason. It seems as though you just expect women to come to you. It doesn't work that way unless you're Brad Pitt.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.