Assalamu Alaikum
I'm sorry I forgot to say one more thing.
When you pray, think of the things that brought you to Islam in the first place; think of your sins, even the smallest ones; think of what you are grateful for that you currently have in your life, even the blessings we take for granted such as our 5 senses; think of those whom you love who are having difficulties in their life that you cannot help them with, or those who are oppressed in this world; think of Allah's justice and mercy. Pray your heart out. Cry if you need to. If you think you can open up to a person who has no idea what you are feeling exactly, then think of how it is to open up to Allah who knows exactly what you're feeling and all of the thoughts going on in your head. Instead of praying with your head, pray with your heart and know that all of the things you cannot control are in the hands of Allah...if you feel the least bit of comfort, that's Allah replying to you. It shouldn't just be about school, or your worries...it's about you innerself and your weaknesses and telling Allah you recognize all the blessings He's already granted you and sometimes that's all we need to feel better; and it's about feeling bad about the sins we have committed but knowing Allah's mercy is greater and just having that hope should us feel a little better; And it's about knowing that whatever burdens we're going through, it's only so that Allah strengthen our back before removing the burden, and having that strength makes us feel amazing inshallah.
When you make du'a, begin by calling on Him by His glorious names, and sending blessings to the prophet peace be upon him, and ask all that you need to ask, nag Him! He created You and loves when you nag...subhanallah if you nagged a person they would get irritated, but not Allah.
Sometimes just walking alone in the park where there's so much nature makes me realize how Allah created this world with such incomparable beauty and makes me thankful that with the same will He created me too just to worship Him and enjoy His other creations.
I hope that will help you..
fi aman Allah
w'salaam