Start segmenting time to invest in YOU. Be specific. For example, say, no matter how my studies are, I'm going to spend Saturday afternoon from 12-6 investing in myself with other people. That last part is important. I'm an introvert, so I get how important reflecting alone is, but you won't be able to do everything alone. Be around people that make you happy and less stressed out. Join an RSO, pick up guitar, go on weekend trips with friends. You will be fine if your GPA is lower than you want. You're getting a degree from one of the top univerisies in the world in a field that is in crazy high demand. Just remember, College is an investment in yourself, and that includes your mental well being.