Hi Clarky and Welcome to the HealingWell Cardiac Forum!!
There are so many things that can mimic heart disease that at age 23, I will hope that this is not what you are up against already! However, with that said, you certainly don't want to take chances and I would strongly advise you that if you are having chest pain, along with left sided jaw, arm back, or neck pain that you head for the Emergency Room and get yourself checked out thoroughly-including a stress test!
Do you notice any SOB (Shortness of Breath)?, Tight feeling in the center of your chest/sternum area? Do you have any nausea? How long does this pain last? Does it come on after exercising all the time? When you're sleeping?
One of the biggest mimics of Heart Disease is GERD or gastric erosive reflux disease. When you drink alcohol this can really bring this particular problem on. The gastric acids actually come back up the esophagus causing such irritation of the esophagus that it will literally wake you out of bed, causing chest pain and left sided arm pain in some cases, too. I know, because I do have GERD as well as heart disease.
I would suggest cutting back on the alcohol to see if this helps you out. If not, then don't fool around and like I mentioned earlier, get to the ER!! Please let me know how you are doing, and keep us posted here!