Kyle,
You've just run headlong into the essence of life. Everything is a tradeoff that forces you to make a choice. Everything you propose is possible but you'll have to live with the consequences of your choices. Do I believe that you can eat whatever you want anytime you want and not suffer some adverse affects - especially over time, the answer is no. Do I believe that you can eat turkey, mashed potatoes w/gravy, with apple pie for desert at Thanksgiving and Christmas with little or no problem - of course. Everything is a tradeoff and every tradeoff is a matter of degree based on how far and how long you stray.
You are young and you'll tolerate deviations from the optimum much better than someone my age. In my 20s and 30s I could eat just about anything and convince myself that I was doing great. At 57 I find it much more difficult to fool myself.
What are your core values and your general philosophy of life. Are you willing to sacrifice your overall ability to do some types of activities, (say you gained a lot of weight and can no longer move around as freely as you once did), because immediate gratification of eating the foods you like are more important to you than maintaining a bit of athletic ability. I'm not making a judgment as to what is right or wrong, good or bad, only trying to point out that these are choices that each of us make every day.
In my case I've reached an age where it is clear that my physical abilities are in decline. The choice I've made is to sacrifice my favorite foods (cookies, ice cream, pizza, hamburgers etc) in exchange for extending the number of years where my physical condition and overall health is good enough to support the activities that make my life worth living. I'm trading the few minutes of pleasure I get from eating my favorite foods for the hours of joy I get from working in my shop making things for friends and family. My doctor has also warned me that my diet may lead to sudden death from a heart attack. This is perfectly acceptable to me because the way I eat also allows me to feel wonderful and gives me the energy and positive mental outlook to do the things I want to do. What good is a long life if I feel miserable and can’t do the things that I enjoy.
I suggest that you spend some time determining your core values. Once you've identified what is most important to you in your life, you can then decide how best to live your life in a way that supports those values. In other words, rather than looking at each decision you face as a separate and independent choice between two opposing things, look at it in the broader sense as to how the decision you make supports or undermines what is truly important to you.
Lex