[smurfgirl]

I think it's important that you know yourself - what are your strengths and weaknesses? In which situations do you thrive, and in which do you struggle? If you're aware of this, you can actively work to improve in the academic areas where you need assistance and in the other areas where you've recognized that you struggle.

Be proactive. Seek out help yourself, do not expect it to come to you. You say "I never really studied in my life, I do not know how." Recognizing that this is an issue you face is the first step, but now you have to go do something about it - look up resources that exist at your school to help you deal with this problem.

In terms of motivating yourself, it might help to have a purpose for being in them - think about how your classes now relate to "real life" experiences and why these topics are important to study. Find out what the applications of what you're learning in class are - maybe you'll be more interested in the applications than in the theory, who knows. It's a lot easier to be motivated to understand when you're learning about things that interest you. Wherever possible, take classes with subjects you're interested in. Take classes that you enjoy, rather than blindly selecting things to fulfill requirements.