I always tell my students not to be intimidated or feel understudied when it comes to speaking in Greek!
The fact that you are learning such a well structured language is great and you should be proud of yourself even just for that!
Think about that too:
Wouldn't you feel grateful and want to help out if someone wanted to communicated with you and in order to do that, he/she went as far as to learn your language? Wouldn't you help him out if he/she got embarrassed or stuck in a word? Of course you would!
So keep that in mind next time you get the chance to speak Greek and just enjoy the conversation!!