LDL 150 - 21yo Male - Trying to figure out why

Hi there everyone, recently I completed some blood work for the first time in my life.

I am 5'11'' and ~200lbs (somewhere between 15-20% body fat)

Everything came back normal except my LDL was elevated around 150.

I have been trying to deduct what the cause of this may be.

Truthfully I eat the same things almost everyday, therefore I am looking at these foods as the culprit:

Breakfast is typically a single egg sandwich I make (1 egg - 2 pieces of toast (lightly buttered) with some cracked pepper over it) or a bowl of plain cheerios (no honey nut) with Fairlife milk. Decaf coffee with a very very small amount of Fairlife milk, mainly to cool the coffee off quicker.

I typically skip lunch or have a drink of water or more decaf coffee (the only 2 things I ever drink).

Dinner is almost always one chicken breast (~12oz) lightly seasoned with Mediterranean seasoning (no fats in the seasoning, just a small amount of sodium); 1/2 cup of rice (sauteed with a small amount of butter) and then boiled (obviously); and a fair heaping of vegetables (broccoli/cauliflower/carrot mix).

I go to the gym 2-3 days a week for ~1h each time with a mix of light cardio, and weight lifting. I have a very efficient, and tailored regime every week that I know works well.

Any further information about the cause of my high LDL would be great, thank you.