That does not sound too bad at all for a 1st start. I always tell my son and his teammates - what makes a good player great, are the ones who have a short memory. Sounds like your doing that. Good for you. Keep moving forward, adjust, improve and continue to work hard...
I was always curious and wondered what big league players 1st stat line looked like...even the studs. You might want to check it out. I do it all the time. It'll put things in perspective for you.
Example: Who's 1st start stat line is this? - Debut: May 22, 2004 (Age 20.214, 16,055th in MLB history) vs. OAK 5.0 IP, 5 H, 1 SO, 1 BB, 2 ER