Try. Always try.

I studied Spanish in high school for three years. I am not fluent, but I still remember a lot of vocabulary from 20 years ago.
Last night, I was standing in line at a grocery store watching the cashier, who only spoke English, trying to explain a problem to the customer in front of me who only spoke Spanish.
I stepped in and used every Spanish word I could remember to help the situation. My Spanish grammar was poor and I used very basic vocabulary, but the Spanish-speaking woman was very appreciative for explaining the situation to her; so was the English-speaking cashier.

So my advice to you is to always try! Don’t be afraid to make mistakes. Always try to speak English with what you know. You can do it!!