Since you want to become a police officer, go for it! If you find it's not for you, you can go into other careers. The skills you acquire as a police officer are transferable into other occupations.
As a police officer, I found it interesting when I dealt with people who accused me of being prejudicial, such as if they wore saggy pants and had tattoos, or rode a motorcycle. Yet, when I asked them why they thought I was prejudist, they said it was because I was a cop. I would of course, point out the hypocrisy of it all . As a cop, you will be judged by the people you encounter. They will see you as "a cop." Nothing more. Nothing less. We all get lumped together. If they are aware of previous bad encounters with cops, they will expect the same of you. This is very important. Why? Because your life could be in danger, simply because you are wearing the uniform.
Unless you witness wrong-doing by your fellow officers, you are responsible only for your own actions. Be the best person you can be, each and every time. I made it a point to be extra-fair to people that I knew were more likely than not to have been harassed by cops at some point in their lives - trying to set the wrongs right, and get them to see me as an individual.
No, I don't regret becoming a cop. I believe I made a difference in some peoples' lives - in a positive way, and got some bad people off the streets. I did not do anything super-newsworthy, but I know I did a good job.
Please let me know if you have more questions!
Best of luck!