Make an appointment with a gynecologist and have a talk about your concerns. You could even ask to speak with the doctor in advance to make sure you're prepared for what the visit will entail. There are also a number of websites that go into great detail on the forms of birth control out there, and that may help make a decision on what's best for your lifestyle. Of course, your body will make that final call
I personally use pills and they work just fine for me. If you can keep up with the responsibility of taking the pill every day at roughly the same time then I would recommend starting there. There are a number of different prescriptions you can try if one pill doesn't work for you, and a number of other options if a pill doesn't fit in your lifestyle.
Agreed with what folks have said about having your tubes tied- it is NOT a reversible form of birth control. I'm all for ladies in their 20s that KNOW they don't want children having the procedure done, though many doctors aren't. But if there is even a slight chance that you may want kids in the future, don't do it. My doctor also recommended against an IUD because I'm young and haven't had children, but she said that she's a bit old fashioned in that sense and that many younger doctors are just fine doing it on ladies in their 20s.