Should I have a baby? What do you think?

Nothing can stop you from wanting to be with a girl. If you like girls you like girls. And having a baby is not a way to solve your issues. You should only have a baby if you don't have any issues, because any issues you have will just negatively impact the child. If you're fighting with your boyfriend and thinking about girls constantly, you should step back and take a good look at your life and what you truly want. Marriage and parenthood are gigantic steps and you're only 21. If you're having doubts, you should find the roots of those doubts before you jump in to anything.