It might be because of 3 main hurdles
1. vowels and vowel groups. Dspite using the latin alphabet, the vowels are prnounces a bit differently than other languages.
2. written v spoke.
written french and spoken french are two related, but different ideas. Where many romance languages are phonetic, french has the final consonant except for CRFL, known by the word 'careful'.
3. required contractions. Some languages have 'this is' or 'i am', but french would have this as 'this's' and 'i'm' by default. contracts are required whenever possible.
if you choose to learn french, don't be worried, it's simple if done in a mangable order. first you must learn to read it, then write it, then hear it (movies with substitles, or cartoons) then get a hand on the grammar, and finally to speak it.
Once you get into speaking it, you will make mistakes, but this is part of the experience. The major cornerstone to french grammar, as with all romance languages, is verb conjugation.