The United States' Defense Language Institute classifies Korean alongside Arabic, Chinese, and Japanese as a Category IV language, meaning that 63 weeks of instruction (as compared to just 25 weeks for French, Spanish, Portuguese, and Italian) are required to bring an English-speaking student to a limited working level of profiency in which he or she has "sufficient capability to meet routine social demands and limited job requirements" and "can deal with concrete topics in past, present, and future tense."[10]
63 weeks, and I've only had 13. So I have only reached "1/5th working proficiency". I think I'll cut myself some slack, and stop thinking, "Why am I learning so slowly?"