Well, I'm no expert, but I'll throw in my two cents...
First off, by my calculations, at 5'7", 61kg, that would put you at only like 132 lbs. I'm 5'9" and about 200 lbs (around 90kg, doing the math real quick in my head). You sound pretty darned skinny to me...by the numbers at least.
Especially at amateurs, its important to fight at your natural weight. Not only do you usually weigh in immediately before the fight (which means if you dehydrate to cut, you wont be able to rehydrate in the hour or two before your match, and hence will be completely worthless), but amateurs are about learning. Its meant to be a place where you can fight and lose, and make yourself better because of it. Also, because your record doesnt really matter, and you're not making money off it, you have no reason to cut weight before a fight, so that you can physically dominate a smaller opponent.
Lastly, don't worry about learning a particular style, or learning all of them. Just learn what works for you and what doesnt. If bobbing and weaving works for you, go for it. If it doesnt, return to your fundamentals and fight out which of them works against your opponent. Life isnt a video game where blastoise will always beat charizard because he has water. If you have good fundamentals, and a good knowledge of boxing, then when you're "preferred style" doesnt work (e.g. bobbing and weaving), then just return to your basics. Feel him out, try things out. See what works against him and what doesnt, as well as trying to figure out how he's trying to hurt you back.
I guess long story short for that last paragraph, if you have a solid knowledge of the basic fundamentals of boxing, then you shouldnt worry about style match ups, as you will always have at least one weapon at your disposal that will work, and at least one way of stopping his from working.
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