Hey Becca!
Do you have a plan you're going to follow? We have a ton of different forums by plan to check out. Even though you're 18, you might want to check out our 20-somethings forum for people in that age range...they're likely to be close to your stage of life.
Pick a plan, work that plan every day as best you can, and keep going...that's what gets you to goal.
Can't wait to get to know you better!