Bad health... depression. Need advice

I just found out I have extremely high cholesterol to the point I could have a heart attack. I’m only 25. Weight 233 lbs. I need to do something about it. I need to get myself healthy. The only problem is that I will start to try and then become depressed and stop. What the hell can I do!!! What can I do to motivate myself.

I swear my depression takes over and makes it all worse.