Thanks for your question on Healthcare Magic.
I can understand your concern. 
Yes, your blood pressure is slightly high. 
So we should definitely rule out cardiac cause for your chest symptoms. 
So get done ecg, 2d echo and 
stress test (trade mill test).
If all these are normal then no need to worry for heart diseases. 
Sometimes undiagnosed stress and 
anxiety can also cause similar chest symptoms especially in the young individuals (21 years) like you.
So 
consult psychiatrist and get done 
counselling sessions. Try to identify stressor in your life and start working on its solution. 
You may need anxiolytic drugs too. 
Don't worry, you will be alright with all these. 
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.