How to make myself look great in 3 weeks?

You've done plenty and gone a bit beyond the norm. Don't do anything else. Just wear something you feel comfortable in, wear your hair the way you like and have a good time when he arrives. Going to all the trouble you've gone through for some guy isn't love...it's like you're trying too hard. You say "don't tell me he'll like me for who I am"....but, seriously....all the outside trappings just fade away about a short time. If some guy went to all those lengths, changing himself for me....I would be a little freaked out. You aren't being yourself...you're trying too hard to be something more for him. Have some confidence in yourself and don't try so hard.