Just starting out! Advice!

Just got the news last week of my cholesterol levels, which I received today. I'm not surprised, I eat like a pig and have stopped exercising this year. However, it's all changing with diagnosis. Switched up my diet dramatically last week and started taking Krill oil. Today starts the gym :confused:

I'm 26, 5'9 and 258lbs. Father has high LDL levels and is on lipitor.

My levels:
Total Cholesterol: 183
HDL: 30
LDL: 86
Triglycerides: 337

Is it weird that my LDL is normal but HDL is low?

I don't want to take medication and have been given a 3 month period by my doc to get this in check or make progress, is that reasonable time frame?

ANY advice is appreciated!