Good stuff TS, given you've been training for 6 months, you're pretty decent for a first fight. You retaliate somewhat well and have good aggression which is something newer fighters tend be a bit slow on, so thats a plus. Only main issue I see is when you press on your opponent, then after a combo, you ease up and step back. That's fine if he's shooting back with something heavy, but you should always aim to press forward. Not sure what the org. your fight was sanctioned under, but most orgs. (esp. in America) usually have ring control as 1/3 criterias.
When you get interrupted, I know its tough, but you need to finish what you start, you can't bail on something if it gets countered/interrupted.
You were actually better at clinching than your opponent was, have more confidence in it, if he's not responding after a knee strike, continue hammering it out.
Good fight regardless, if you have good coach, they'll work on your sticking points and get you up to par for your next fight. How has your conditioning been going? Have you been training rounds matching your event? A mistake some guys make is assuming that doing say 5min rounds for a 3x2min fight will be better because its more. That's not the case, what happens from that is guys will end up conditioned to pace themselves over a 5min round, and the intensity of a 2min round will wipe them out. If you haven't been doing this, then ignore that part.
I would love to fight for an org. that has no headgear for their first/novice fights.