I'd say that 1) he may be shy or 2) as Osias said, after being friends for so long, trying to start an intimate relationship is hard. I've been there before. I've been friends with one girl for awhile, and then we started going out, but really, the only difference was the title, and after about 2 weeks, she told me that she'd rather remain friends and I agreed. Just because you feel you develop feelings for someone, it doesn't mean they will remain during the relationship. You sometimes might want to just back off at this stage and take things like you were friends again. This way, you can keep the relationship going, but not make it so awkward. Maybe invite him out to the movies once in awhile, and wait for him to become more comfortable around you, that way you start developing a better relationship. I may be a year younger, but I have so many older friends that I talk with about relationship problems, and out of most of them, they just seemed to take things to fast. You say you've only been with him for a few weeks, but if you thrust yourself on him it will make him uncomfortable. I do not mean this in any way, only saying that sometimes, you have to realize when to back off, or when to just regress to a stage that made both of you feel happy (which doesn't mean breaking off a relationship at all). I will say that some younger people do take relationships in a way different that you would when older, but that is not true for everyone, don't forget that all of you. I know of a few adults that developed a relationship that became more and more serious as they're school life continued on. Yes, do not throw away your school life for a person you think you love. Most likely, you may develop a serious relationship with someone, but when college comes along, you'll have to choose one or the other (it's a very low likely hood of a person getting accepted, let alone applying, to the same college as you). If you feel that it is the right path to be with this person you love after awhile, then go for it. But realize that future events can unfold you didn't see (divorce, death, the family worker getting laid off) and that your education that might have saved you from a mess you get into isn't there. I'm not trying to be pessimistic, but I'm trying to give some good relationship advice to younger adults. I myself have been overcome with relationship troubles once, and my grades started slipping HORRIBLY. I went from an A in my math to a C. And I'm still trying to work myself back up from what happened. You have to realize that in this stage of the game, you are young, so allow yourself to have fun with your partner, and not expect your whole life with them. Maybe in time, you will end up living your life with that person, but you also have to think of all other possibilities and just have fun with your young life. I'm sorry for lecturing you, even when I'm younger, but I hope some will take my advice into consideration.
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L4Justice
On Chettry's comment, I want to say this. Developing a serious relationship at this age is always possible, but for it to become long term (after school) based is a one in two chance. I won't say I agree with you, or disagree on that subject.
On the otaku not being nerds, of course we aren't. The stereotype of nerds is a person strong in school subjects that supposedly doesn't go outside, and only studies, plays online games, and board games. Of course this stereotype is not true at all, but kids worldwide have decided that anyone that watches anime is a nerd. For some reason, this has been based on it because people do not think of us as normal for watching something foreign to our country (and I feel bad that they feel this way, because they just don't seem to enjoy something because it is not 'normal' for them). I once met a kid who said he'd never read manga or watch anime or have anything to do with Japan because they bombed Pearl Harbor. I felt it was unfair to the Japanese, because our history isn't spotless of blood and idiotic mistakes either, but some people are just like this. It is because we do something people consider so alien to them that they seem to group it in with 'nerds'. It is sad to say it, but it is truth. Otakus have been merged with the stereotype of 'nerds', but it does mean that we are ones. 'Nerds' are also suppose to be very ugly, but of course there are many good looking people that are otakus, and they're an otaku because they like what they watch. Otakus are not nerds, and the term is completely used wrong. Of course today, the stereotype for nerds is dying down, but it is still out there. We cannot change how others feel about us, but we otaku know that we are not 'nerds'. We are fun people, that are very kind, generous, and can be a 'popular' or a 'jock'. So yes, Otaku is a misused word, being confused with 'nerd', but I feel that some people will think that, and if they wouldn't like to change how they feel, it is their own personality, and they're the only one who can control it.