I had the same problem. The best way to counteract that is by looking at what you’ve accomplished and not what you have not. I used to second guess myself all the time and struggle with putting words together even when I had enough to start and hold a conversation. When I realized that I was my own worst enemy I stopped worrying about my lack of progress and started talking. Once I did that and they understood me, I started to progress again and I had enough confidence to go out and use the words I did remember and start conversations. And most Chinese native speakers are willing to help you! I hope that helps!