When you talk to foreigners it's ok to make mistakes and ask about the mistakes you made. Try to say it again and keep a positive mind, and keep going on.

When people talk to you and you don't get it, tell them to repeat the sentence again or using other words. Keep track of this learning system.

Make mistakes now, so you'll do better later, and you'll do it really well in the future. 

 It's ok since you try again with the knowledge and with the purpose of doing it better next time. Train enough and believe in your memory.

Keeping a positive mind will help you a lot: Many students who I consider extremely smart is because they don't allow themselves to feel frustrated and take everything like a funny challenge.

Getting surprised and doing an active effort to learn a language, are situations that won't come back... 

ENJOY THEM!