My mum says I'm selfish?

no you are definitively not selfish. Having kids is a GREAT thing and I really do understand why you would want that :) Its obviously not selfish because you're basically saying you want to take care for someone. The best way, if you're a "" it may be better from a sperm donor, because then the kid will be more normal as adopted children just wont be the same. though it could be way more easy if "straight". But at the end of the day, it's who you love, either if it is a boy or a girl :) I really do hope I helped :)