First time flyer, will be alone...... any tips?

I'm 13. In July I will be flying alone from Wichita to Dallas. There will be a 2 hour layover in Dallas then I will go from Dallas to Seattle. I've never flown before and am deathly afraid of heights. My mom will help me through security and stuff when I leave Wichita, but I'm scared that when I get to Dallas, I'll get lost and miss my flight or something.