It is very easy to get caught up in numbers, I myself did when replying here: Recommendations on my Macros for Fat Loss - #2 by Voxel
But, maybe one of the best replies ever written on here when someone new shows up is this: How Does My Workout Program Sound? - #35 by isdatnutty
And as far as diet goes, well that reply goes into it. Have three hearty meals a day.
If you need more specific guidelines, here are some I enjoy that will work quite a while for you,
- Eat two palms of protein
- Eat two cupped hands of carbs
- Eat two fists of vegetables
- Eat two thumbs of fats
No need to be in a hurry. You can have a tremendously better body in 36 months. You are only 21. This article was written for someone at another level than you, it is probably an ideal way to diet for most people. But, to lose some fat you do not need an ideal diet yet. When you are at 12% BF trying to get to 7%, then you need to really get out the scale and do things at this level of minutiae and time your carbs. But at 30%, just exercise a lot, eat, and get stronger.