All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
All forms and kinds of cheating are forbidden, as the Prophet said, “Whoever cheats us (deceives us) is not one of us.” [Al-Bukhaari and Muslim]
Whoever cheats must repent to Allah from it like for all other sins and be determined not to do it again in the future.
The fact that you regretted doing it and feel sorry because of cheating are evidence of your sincere repentance, so you should try to be righteous in the future, as you are commanded, and not do this again.
As regards entering college, then there is nothing wrong with it, and enrolling in college is not transgressing the rights of others because all clever students enter college, as you mentioned, so you should continue your studies and not give any importance to this matter so that this will not turn into Waswasah (obsessive whispers); otherwise Waswasah may ruin your whole life.
Shaykh Ibn ‘Uthaymeen was asked, “I graduated from high school, but I cheated in some English subjects. Now I am about to enter university, what should I do? Should I repent from this?”
He replied, “You must repent to Allah and not do this again, because cheating in the exam in any subject is indeed cheating, and it is proven that the Prophet said, ‘Whoever cheats is not one of us.’ So you have to repent to Allah and enter the university with repentance and continue to avoid cheating. If you get a university degree without cheating, then Allah accepts repentance from His slaves and forgives sins.”
Allah knows best.