"Success is not so much what we have as it is what we are."
Dwelling on regrets won't make you successful. Those who emulate others the one's who succeed. I don't know how many time I've thought to myself that I could've done better in the past. Those thought's will only hurt you not help you.
Focusing on your goal. If you want to be an entrepreneur then do whatever it is you need to do to make this dream attainable.
Over the summer- be sure to read some books pertaining to what you want out of life.. it could be self-help books or even business books to give you an idea of what REALITY is like to those who are in the field you're pursuing.
Stand Out: Most importantly find Your breakthrough Idea and Build a Following Around It. Whether it's through social media or marketing you need to be heard in order to succeed.