I would rather not have my girlfriend's friends come over at this time.
What is the reason why you do not want them over?
I hate when she's with her friends because they are so loud.
I can understand why you would be feeling that way. You don't have to like all of your partner's friends. Maybe you can talk to her and ask her to invite them over when you aren't around.
No, I prefer to be alone.
Also, if it is your home than you have the right to not let someone come to your home. If you find your girlfriends friend's to be annoying than maybe not having them over is a good idea. You should be ok with spending time with them though since that probably makes your girlfriend more happy.