Birth Control

So I'm trying to figure out things about birth control options. I know the most common is the pill, but in honestly horrible about remembering even with an alarm because I am so busy and sometimes I don't even make it home so I may have days where I wouldn't have it with me. And if I do go with the pill there are soooo many I wouldn't even know what to choose. It makes me nervous because I tend to be sensitive to these things and they make me incredibly moody. Also has anyone tried the injectable thing in your arm???? Does it work??? How often do you get your period on it or how does that work? Any suggestions would be great!!! Thank you!