It was tough, but I made it. I'm a college graduate.
那虽然不简单, 但我成功了。 我现在是一名大学毕业生了。
I am sorry that you have a disagreement with your father. Personally, I think it is important to follow your interests and your abilities, and it sounds as though you have plenty of both of these already.
我感到遗憾,你和你父亲意见不一致。就我自己而言,我认为重要的是从你的兴趣和能力出发,听起来好像你已具备了这两点。