Keep on being strong! Remember the Lord will never, I mean even, give us something that we are not capable to endure and overcome. Although challenges may seem hard you obviously have a strong spirituality about you and will soon find ease in your trials. Remember to always look to the Lord when you feel like nothing else is working. ?
I am 18 as well, turning in my papers soon for a mission and I understand what you mean by worried about the future. If you have a patriarchal blessing I suggest you read that as soon as you can! It will give you hope and you will soon forget the bad, and start to ponder the good:)