It's definitely worth it, motivation might be hard but when you start noticing changes that becomes the motivation in itself then after a while it just becomes normal and you feel strange if you haven't been. You don't have to be massively ripped to feel good from it, woman usually say they aren't interested in muscles but from my experience that is total horseshit, even if they don't go for muscle guys they are attracted to guys with a good frame and bigger shoulders etc.
Being skinny has one big advantage in that you will see any gains you make quickly as they aren't hidden under much fat. Some people say skinny guys can't get big, but again I totally disagree, I have a mate who was stick thin, never got any girls then started going to the gym, he is ripped now and as soon as he started he started getting girls. i guess it's down to him looking good but then also some aspect of him being confident from it.
Apart form picking up girls or guys, you will feel better, you will be stronger, more healthy and when you get old it will keep you feeling and looking young. Just do it (not necessarily with Nike on)