23 year old female and i feel like i forget a lot even if it's something 5 minutes ago. is this a problem or stress related ?

Depends...: It all depends on other symptoms.If you are aware that you are going through a lot of stress lately and you don't suffer of any illnesses otherwise then this can definitely affect your attention. Anxiety, depression or merely acute stress due to external events can cause problems with your memory. However, if this is something that keeps happening and severe follow up with your doctor.

Memory problems: It could just be stress related or due to fatigue. However, there are also rarer possibilities such as thyroid disease, Rheumatologic diseases, or neurological diseases that can cause your symptoms. If it persists, see a healthcare provider for further testing.

Short term memory: Occasional or episodic short term memory difficulty can be stress related. You should seek emergency medical attention if you find other associated symptoms such as changes in your vision, difficulty speaking, or difficulty with using your arms or legs or walking. If the memory difficulty is affecting your ability to accomplish your normal activities or job, see your doctor.