Unfortunately, I think that is the nature of learning a new language, not being able to express complex emotions until you are close to fluent. You may be able to say, "I am sad." or "I am excited.", but to state a more complex thought is difficult.

I find that in French. I've come to grips with that fact. It does help living in a bilingual country though since even when I was in the French-speaking area, there were English people I could express more complex thoughts and feelings to.

It's also natural to sound awkward as you are learning but that's not stupidity. It's essential to be willing to be wrong sometimes, to be uncertain you are using the correct word or the proper verb tense. Hopefully you have someone to correct you, ex. a teacher or fluent person, but even if you don't, speaking and reading, and I suppose even writing, it essential.