I’m sorry you are so unhappy. I hope it is some comfort to know you are not at all alone. The teen years are challenging for most kids.
If you were seeing me, my first concern would be how much you are sleeping during the week. The long hours in bed on the weekend may be an attempt to make up for not enough sleep during the week. You really, really do need 8 hours a night every night to be healthy and mentally balanced and alert. Turn off all screens at least an hour before bed time. Develop a good “getting ready for bed” routine. And do everything you can to get that amount of nightly sleep. Doing so will help you cope through your teen years. Really.
I can’t determine if you are depressed on the basis of a short letter. What I can suggest is that your emotional ups and downs may be a result of your body adjusting to the hormonal shifts that often occur at your age. Your doctor can do an assessment and can help you know what to expect and what to do about it.
I’m sorry you feel your parents would think you are “weak” if you asked for help. If your mom has suffered from depression, it’s possible that she would be more sympathetic than you think. It’s worth a try.
Do consider talking to your school counselor about how you are feeling. School counselors often maintain a list of resources for teens. It may be that there is a counselor in your community who specializes in teen issues.
Meanwhile: the best antidote for feeling alone and lonely is to get active in something to take your mind off yourself. I hope you are involved in a club or team or volunteer job where the focus is on getting something done, not on your internal state. Doing good things will help you feel good about yourself. When a group of people focus on a shared goal, they often form good friendships.
I wish you well.