>>1 Shutting yourself off from the real world and coming here I wouldn't necessarily say is a bad thing. The real world often really sucks so it's good to take a break from it and if your lonely, talk with people online who understand you. There are a lot of people here to help you so when your feeling down it's probably best to turn to us if there's no one in the real world that you can rely on.
I wasn't the smartest person but I never really had problems with my grades though so I don't know what it's like but I definitely know what it's like to be lonely and to shut myself off from the real world. I only really exist online because there's no one in rl who understands me or that I can rely on.
One thing that I'm wondering about though is if you're not doing well in school because you're unfocused and going through things? If that's the case then it's best to work through it first so that you can work and learn better in the future in my opinion.
We'll still be here if you need someone to talk to or just to listen and care :D