I think I'm a bad friend.
Why do you call yourself a bad friend?
I'm a bad friend because I don't meet up with my friends as often as they want me to.
If you really feel you are a bad friend, then you should try to do better and meet your friends more often. If you are really unable to meet more, then you should consider whether your friends are putting unreasonable demands on your time. They might not be good friends if they aren't thinking about your needs too.
I see it more as me being too busy for them.
You should let your friends know the reasons why you aren't able to hang out with them so often. Let them know you still want to hang out and keep in touch. Plan ahead and set up a schedule so you can fit them into your busy life.