I'm 20 year old female what are signs of heart attacks?

Many. Chest pain, short of breath basically. Heart attack is quite rare in 20 year olds, especially if you are able to do vigorous activity without symptoms. Musculoskeletal pain, panic attack, heartburn, lung issue much more common. A type of attack where the coronary arteries spasm can occur rarely. When in doubt, get checked out, especially if you notice a change in your ability to do things.
Rare in 20 year old. Heart attacks occur in middle aged to elderly and are due to vascular occlusion of one of the supporting (coronary) arteries of the heart. Symptoms include chest and left arm pain, sweating, collapse, fearful feeling, faintness and loss of consciousness. Signs are medical data detected on laboratory and radiological exams. You are too young to have a concern about this.

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Can anxiety creates heart attack in a 20 year old male?

No. Kitten, anxiety can imitate anything but it usualy does not hurt. It does not mean it should not be treated. Read more...
Unlikely. Stress can cause the heart to work harder but to cause a heart attack directly..Unlikely. When the heart works harder, and if one has a clogged coronary, then may be a heart attic ensues. But this is unlikely in a 20 year old unless the same 20 year old is using hard drugs such as meth or heroin etc. If not, i would not "worry". Read more...

I have almost all symptoms of a heart attack except pressure on chest. I am only 20 years old. Should I be worried?

Likely panic attack. At your age. However, best to check with your doc to be sure. After normal results you will be assured and have better sleep. Read more...
Not likely. Unless you have a congenital heart problem, it is highly unlikely for you to be having a cardiac issue. If you are that concerned, talk to your family doctor about your symptoms. Read more...