Does the shari'a law apply to muslim foreigners?

Hello.

I am an Indonesian citizen and will soon move in to Petaling Jaya, Selangor, for work employment. I am a Muslim but, to be honest to myself, am not that religious -- I could say I don't have any belief or religion anymore, at the very least I am not that devout practitioner.

However, I am concerned about the dual law that prevails in Malaysia. I've read that the Shari'a law is imposed to Muslims living in Malaysia, however I cannot get any confirmation whether this also apply to foreigner Muslims or not, nor the level of enforcement of the Shari'a law, particularly in my soon-to-be my new neighborhood, Kelana Jaya. In short, I am concerned about doing some activities that would be haraam (illegal) in Shari'a law but I oftentimes do back in Indonesia without anyone really cares. Such things most commonly for me are: 1) buying alcohol in stores, 2) going to bars/pubs, 3) having girlfriend sleeping over at my place, 4) not doing fasting in the Holy Month of Ramadhan, and the like.

Would I be subject to the local Shari'a penal system if I am caught doing one of those activities in Malaysia? I am particularly concerned because physically I am almost indistinguishable from a local Malaysian (similar facial shapes, similar skin tone, etc) and that my full name contains the name Muhammad (it's such a common name in Indonesia and Malaysia). If possible, please do explain on the separate things as I mentioned above, and if any, the tips or tricks to "be safe" with the activities above.

Any constructive comments, explanations or insights would be very much appreciated. Thanks!