I think you should try to relax and just let it go. I mean, even if you don't have the right vocabulary and if you don't have the exact grammar rules in head, that's ok. Just try to do your best and don't get anxious feeling that the person towards you won't understand you or judge you. It seems you are already working hard on it with a tutor etc... now you may just need to practise more and more with different people who can speak French. Even if it's for a basic conversation to start, it will be fine and I'm sure you'll do good in the end !
Don't give up !