How can I emotionally toughen up even more?

I used to be the sensitive kid who got bullied in middle school both by teachers (called incompetent, good for nothing) and classmates (spat on, punched, pestered). In high school I was in with a girl and I suffered a lot in the relationship. Now, in my early 20s, I've toughened up, but I feel it's not enough to face the transition into the workforce and to become 'successful'. I am intellectually strong and it would be a shame not to achieve my potential because of my emotional sensitivity. The people I am closest with tell me the same thing: You are never intellectually unprepared, only emotionally

How can I emotionally toughen up even more?
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