So tonight I really realized I have a problem, and I'm not sure what's causing it.

So honestly i'm a good looking man and i'm in style/popular/ etc.. I party every weekend-i'm a DJ/producer as well and dj every other week at clubs (very known ones locally as well) and have opened for very famous DJ's, etc etc... I walk around a party and I even NOTICE that a lot of girls look at me and through the corner of my eye I even see them talking to each other and their whole group looking at me..

I get a lot of IOI's when I make eye contact with a girl , but you know what - I NEVER have the desire to go up to one and initiate conversation. like I WANT to , but I always feel like I have better stuff to do than be doing that. IDK why. I think i'm a little intimidated but I shouldn't be..
Even when a girl goes up to me and talks to me I like blank out and dont really know what to do besides keep a conversation about nothing going- I even feel awkward sometimes doing kino escalation unless we're dancing (or unless i'm drunk)..
Like if I go to a party and see a very hot girl i think in my mind like, damn she's hot, but I make no effort to go and talk to her. I have nothing driving me to do it and I just chill with my group of friends and don't try ANYTHING.

I feel so awkward cause I was studying in Mexico for a semester and it was so fucking easy scoring chicks there (probably because im light skinned etc) - scoring chicks everyday at parties, with little to no effort (even broke a few girls friendships due to this) . but now I came back to my home in U.S. and everything is so different. idk what to do, I need a drive to do because there is no motivation in my head.

can somebody please help me. thank you

Avoidance. That's your problem. The lack of desire is just a way your brain tricks you into avoiding a stressful situation. It happens to me too I make up excuses like I'd rather just chill with my friends or whatever, have a quiet drink, I don't feel like approaching tonight, etc. It's just avoidance of a possibly stressful situation.
I think it was 60 who explains this really well. He also talks about micro-avoidance. Like everything you do prior to actually approaching has to be in non-avoidant manner, if you avoid little things that could cause some anxiety, you'll avoid the approach too. Here's a quote form his book Opening Made Easy:

"Momentum & Micro-Avoidance
On a base level if you can’t approach yet you should at least not be avoiding other small things at the bar like ordering an ice water or asking someone for a seat (see micro- avoidance). By not avoiding the other things you want to do you build positive social momentum and give your self esteem a boost. This confidence often leads to approaching women.
Social Exercise: See if you can go all day without avoiding anything that you want to do (besides approach women). This leads to feeling good about yourself and excited about your life."

I suggest you read this book, it will answer your question thoroughly.

You have a really good social status, just changing the way you think so your brain doesn't play tricks on you will get you all the girls you want.

Cheers!

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rAFC and yes, I'm a chick.

I have bursts of being a lady, but it doesn't last long.