I Have a Secret Crush

I am in love with my customer.
I need to share my story. I fell in love with a customer of mine and it's getting out of my control. I work in retail and he is our regular customer. We have a wider circle of customers who buy and visit our storehouse regularly. I've been working in this area for 8 months so far, and I fell in love with him the moment he smiled and teased me (I was new and nervous as hell). We are now on first-name basis. He is a bit older than me (I'm 25, nearly 26 and he has to be at least 36 - 37 years old). He comes to visit us about three - four times per month, but only stays for a couple of minutes. I am intrigued by him, I adore absolutely anything about him.

Althought he is not my age, he appears to be very youthful and has youthful aura around him. He is also adventurous, playful, likes to joke, has great sense of humour, speaks to me with sarcasm (which I love) and has something a little bit mysterious/tiny bit dangerous vibe. I've gathered as much information about him as possible and it even made me like him more. It's his charisma and the way he simply is that have been drawing me towards him for past few months. I simply can't help myself, I am just obsessed. I think about him all the time and even thought I can only see him few times per month only for two or three minutes, those moments are everything to me.

I always try to be polite and funny and I even try to flirt with him a little bit (which I am awful at, I've always been shy around guys, especially those I like and I am kinda socially awkward, but I am trying to outdo myself and do my best). Somehow, I feel like I have no chance with him (he is way out of my league), but sometimes it feels like there's that spark - a chemistry between us. I am so confused. One thing I know for sure - I am head over heels... Is or has anyone ever been in similiar situation? I need advice or hear your experience...

(PS: pardon my poor English).