How much trouble am I in?...please help!

Ok, I could be in real trouble here so please someone help me..if you can.

Its a four stroke question and if my brand new CRF 250 goes bang it will be my own fault (not a bike defect)

ok, here's the story.
i'd pretty much broken it in last weekend so i decided to check the valves, no probs their, they were all sweet.
put back together, new oil filter, new Trans and engine oil and ready for riding today.
(I've been changing engine oil every race/practice day and the the oil filters every other race/practice day, so i've been keeping on top of that)

So, i went to my local practice track today, had a good days riding then as i pulled off the track after my last session i noticed a sticky substance around the side of the cylinder casing. so i stripped the tank off and saw engine oil on the top of the cylinder and on the underside of the fuel tank. I couldn't for the life of me figure out where it was coming from, the cylinder head seal was correctly fitted, no cracks. so i was puzzled. i called it a day and jet washed it.

when i got home i stripped it down to figure out where this oil had come from. when i took the cylinder head bolts off i realised what happened. one of the cylinder head bolt rubber washers had gone walkabouts and i hadn't noticed when i put it back together.
oh sh!t.
i took cylinder head off. it looked ok in there. no signs of dirt apart from on one of the camshaft holders. in the top of one of the sunken areas on the holders was a tiny pool of dirt and water. probably 2 droplets of watery oil and a tiny pinch of dirt. so i took the holders off and cleaned them making sure i didn't drop any dirt in the engine. next i drained the engine oil completely and took out the oil filter and replaced it and the engine with fresh oil.
put back together and fired up.
it sounded ok but i'm not a four stroke expert (this is my first) ticked over fine, reved fine.
i poured some of the old engine oil into a glass to have a look. it was cloudy as normal used oil is and there was no dirt that i could see or feel in the oil. BUT there did appear to be a very slight whiteish swoosh in it (tiny amount) but apart from that it looked ok.

so, anyway, i'm scared to death that I have finished off my pride and joy and i've barely broke the thing in.
so, what do you think. have I destroyed it?

thanks for the reply.
Like i said, it looked fine in the cylinder apart from that one little pool of dirt. it was a tiny tiny amount and the oil looks pretty good but I'm aware how sensitive four strokes can be.
it's kinda off annoying cause i'm so obsessive with oil and oil filter changes and air filter changes.
i do everything to keep it all clean insideand i do something stupid like that!
thanks again.

very true.
I guess it's been hammered into me by so many four stroke users that four bangers hate dirt, water, air, being over reved, under reved. over used, not used enough, fully synthetic, semi synthetic.

you just hear and read so much about how sensitive four strokes are you start thinking that your sitting on a timebomb and your just waiting for it to go horribly wrong. kinda made me paranoid about riding my bike.
kinda sad really that i feel that way cause it really is an awesome bike.

Thanks guys

Can't tell you how much a relief it is to know that things should be ok.
Just want to thank you for reading and replying.
Guess I can go enjoy it again!