Need advise please thanks:)?

Ok I'm going to be honest i'm 19 a little spoiled and..I'm a coward I have extreme talent in tennis enough to turn pro and make a lot of money to but I'm too afraid of my own shadow...I've played with pros in the top 100..I have ability and have the talent secure myself and my family but I end up giving up and not playing my best sometimes.. I keep wilting under pressure...I have no heart and I hate it. I keep disappointing myself and my family I've prayed and prayed for a change of heart but..I'm still the same. I'ts so frustrating and I don't know what to do ..Its gotten to the point that I hate myself and want to take my own life because ...i know it's crazy but I know its not an option. I know I might change the hard way by moving on and facing life..getting a second job and apartment but My opportunity with tennis with be gone. Even tho people consider me a Great person but I'm a coward and it ruins my life How do you change a heartless person into a strong courageous person without doing it the hard way. I really need help with this what can I do???