In Touch can exclusively reveal the cast members of Teen Mom 3: former 16 and Pregnant teenage mothers Mackenzie Douthit, 18, Alex Sekella, 18, Briana DeJesus, 17, and Katie Yeager, 19. In exclusive interviews ONLY in In Touch, on newsstands now, the girls talk about why they decided to do the show and what you can expect from the upcoming season. “I was scared to do the show [initially],” Mackenzie, mom of 14-month-old Gannon, tells In Touch. “But I can’t look back and change the fact that I got pregnant so all I can do is look towards the future.” She says she and fiancé Josh let viewers into every part their life. “You’ll see our good and bad times.” Alex plans to show viewers the struggles of working two jobs to keep 15-month-old Arabella’s troubled dad out of their lives. "I refuse to let him see her,” Alex tells In Touch. She hopes the show will help teens learn from her mistakes. “I see too many young girls making the same mistake I did; being sexually active at too young an age.” Briana, who got pregnant with daughter Nova just a week apart from her sister, says her story is different from the others. “My story lets you see, there are different choices,” Briana says, who decided to keep her daughter, while her sister had an abortion. “With every choice you make, there’s hardships. No matter what, it’s still going to be difficult, but you still have a choice.” And mom to 14-month-old Molli, Katie, isn’t letting teen pregnancy stop her from fulfilling her dreams -- she's studying to be a social worker and hopes her story can inspire others. “I want to help people,” Katie tells In Touch. MTV has yet to announce a premiere date for Teen Mom 3. Teen Mom 2, which stars Leah Messer, Kailyn Lowry, Jenelle Evans and Chelsea Houska, returns on it's new night, Monday Nov. 12 at 10 p.m. on MTV.For more from the Teen Mom 3 new cast members, pick up this week’s issue of In Touch, on newsstands now!