I have 68 years of experience traveling. You need to start planning and preparing now! Unless you got a lot of money to burn - I mean like 10s of thousands - you better think about what is going to happen. When you get to Thailand, it's too late to start getting ready. You are already handicapped because you are not an experienced traveler. You probably have no idea how to pack for that long. You better get your ducks in a row before this becomes a disaster. Seriously!
RE: 21 and I have no clue what I'm doing!