It's not that your lover means to dump on you. It's just that you're so adaptable and dreamy that it's easy to forget that you're a human being too, with problems of your own. So your dynamic lover, so in touch with his or her own needs and feelings, tends to hog all the bandwidth, and your issues go unresolved and undiscussed.
Yes, yes, it doesn't come naturally to you to ask for equal time. But this relationship is pointing towards a problem you face in every aspect of your life, and turning your back on it isn't going to get you anywhere.The key for you is learning to balance your own needs with that of others. It's fine, sweet even, to spend lots of time caretaking your loved ones. But you must find a way to advance your own projects and nurture your emotional self as well. Perhaps some sort of rudimentary schedule is needed? Tuesdays and Thursdays are days to spend with your lover, but Mondays and Wednesdays are your time? Whatever sort of compromise you work out will help you learn the art of balance, and not just with your significant other.