Cant breathe fully and do know what it is. could it be asthma or something else wrong?

See a physician: The best pulmonologist in the world cannot diagnose your problem from a description on the internet. But a practicing physician who examines you can. Please see your doctor very soon and describe your symptoms. In a very short time appropriate tests and physical examination will reveal whether the problem is respiratory, heart, chest wall, digestive or anxiety.

Shortness of breath: Shortness of breath or difficulty breathing can be due to many different causes. Most of these are either a respiratory illness or a cardiovascular problem. However, sometimes shortness of breath can be due to anemia, anxiety, gastroesophageal reflux, or even nasal congestion. So you really need to see your doctor for further evaluation. Go to the er if symptoms worsen or become severe.

Possibilities...: There are many possibilities for your shortness of breath, asthma being only one possibility. Other possibilities include copd, bronchitis, interstial lung disease, pulmonary embolism, etc. There could be a cardiac etiology like congestive heart failure. This is a serious symptom and needs to be evaluated by a doctor asap. Go to the er if severe or worsening.