Let me tell you something. I was set for all top grades in school, but then I had an accident and lost out a lot of my education. I still got all passes, but not top grades. Did it hold me back? Okay, so I didn't get my dream job, but I made peace with that and I now work for myself as a freelance writer. You are intelligent and you are worth something. Embrace your skills, embrace your ability to write. Practice your hobbies and just keep getting better at them. Sooner or later somebody will notice the skills you might not have even realised you have. Good luck.