The difficulty of a language depends on several factors. Here are some for you to consider when choosing a language to learn:
- Is your goal to become fluent or to know only enough to get by?
- Is the language in question close to your native language?
- Do you enjoy learning the language and about the culture that surrounds it or was it simply a requirement for school?
- Are you talented at learning languages?
- Does the language use an alphabet (or ideograph system) other than the one used by your native language?
- Do you have a specific reason/motivation to learn the language?
- Are you good at copying the pronunciation and speech patterns of the language?
- How are you going about learning the language? (taking a class, teaching yourself, etc.)
- Does the language have different syntax than that of your native language?
- Do you have a visual memory or do you learn by copying?
I was in a Spanish 2 class in my Freshman year of high school too and the teacher wasn't very nice, so I know how you feel. If you want my personal opinion of what language is easiest for a native English speaker to learn, I'd have to say Swedish because many of the words are similar and the grammar is almost identical to English.
Anyway, I hope this helps.