Hi, Jess. I am new here too. I have a son (10) with AS, and I also have it (self-diagnosed). Much better to know now than find out when you are 44 years old, believe me.
On the obsession with forum sites, me too. Turn it into a positive. Learn as much as you can about things that interest you, but try to focus on the non-destructive types of interests. I know its hard to stick with things that don't interest, but hopefully coping will become interesting enough to maintain your focus.
It's not so much of a problem, by the way. In learning how to work with my son, I found that it's more of a challenge to make people understand that it is biologically impossible (or really more like highly improbable) for someone with autism or Aspergers to continually focus on something that is not interesting to them. I can't even count the number of times me, or my son, looked away from his mother to see what just happened on TV and completely ignored her. It took years for her to understand that it was not intentional.
Of course, we all have to learn how to deal with disinteresting stuff (like for me, 19th century British literature. Sorry!) Learn as much as you can about what is in your control and what is not (e.g. what are you biologically illequipt to do vs. what you would just rather not deal with). And, by the way, that's your Dad's job too. I know it's tough for you, but it's tough for him as well. There isn't very much literature out there right now, nor doctors well versed in dealing with family interactions with high functioning autistics. Try making some time with him to learn together, perhaps watch a video about your condition together, and then talk about how it made the both of you feel, and then make a plan on what each of you is going to do in the future to help you. And, by all means, use the resources on this site to learn!
By the way, and sorry for sounding like an old fuddy dad, but you may need to get to your mid-20s before you know if the "easily getting upset" thing is your condition or the hormones. And even if you figure that one out, he most likely won't. But in either case, it is mostly nature, not nurture.