I don't get it why you are nervous in front of foreign guys. They are just normal human beings like us. And according to my experience, most foreigners are friendly and polite. Next time when you talk with foreigners, keep in mind that they won't make you uncomfortable unless you do something stupid.

I am a foreigner here, and I do feel nervous speaking to local people! Yet I have found that people (in general) are quite kind when you make an effort, and they will be patient enough to try to understand you. I have made enough non-English speaking contacts to feel less nervous about approaching new people. Just start with small interactions: hello/goodbye in passing, asking basic information, and so on. Don't feel that you have to give a one-hour speech. ;) Or, just learn to ask questions and try to listen. Most daily conversations will literally last a few moments.

It is noted that people from some cultures are naturally more shy and reserved. American Indians are and certain other ethnic groups are. Don't fight your natural self. Just focus on the conversation you are having and take it from there. The charm of some people is their shyness. It's a good thing.