How can I get rid of a stressful life?

Hello, i am 19 years old. Lately i am very stressful with everything. I am going to a University that i dont like that much, i don't have that many friends and my good friends are living far away. I have a boyfriend but i dont see him very often because he works, i live far away as well and i have classes everyday. Every night i feel my heart beating like crazy and sometimes my heart beats really loud that i can feel it in my chest. Its so scary, sometimes i feel also like i can't breath. I am an onlychild and i have some problems with my parents mostly with my father he is overprotective and i feel like i am not free. Everyday something happens and i can't rest well, sometimes i also have hard time sleeping because of my heart. I have done a medical examination 3 years ago and we didn't find anything wrong with my heart everything is okay. Everyone is telling me that i am stressful. I really don't know what am i gonna do. I want to stop being like that and have a normal and beautiful life again without thinking all this things and without having my heart beat weird like that. I am really afraid. What should i do?
How can I get rid of a stressful life?
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