You haven't mentioned your age.
There are minor grammatical errors.
I put the fragment because I feel it isn't phrased properly and I unfortunately am not able to do a good job myself so I would be thankful if some experienced forumer would look into it.Everyone has some ambitions to achieve(fragment, consider revising). But we can never achieve our ambition unless we work hard and put effort towards it.(use either the work hard, or the put effort, not both)
In my opinion the reasons for attending college or university is because everyone desires to achieve their ambition.
Some people look for a good position in their future career. For example you cannot be a doctor if you don't enter medical college, and if you are aiming to be an engineer you have to study at one of the engineering college.
At the same time we find some people who attend university because they want to earn more money, because they are sure that as an educated person, they have a chance to be better off earning more than an uneducated person.
We can find also some people whose priority is to increase their knowledge and having new experiences in their life.I strongly believe that this group of people will be more successful than the other group /without saying that the others has ill will of attending university or college/(fragment, consider revising).
Student or Learner