Hey there, It sounds like you're going through quite the rough spell. I get that it can feel like you're completely alone at times, but remember, you are NEVER alone.
Your parents love you, I can guarantee that. From what's going on, I'd say its pretty safe to assume that they are VERY worried about you. After all, you're their baby. No matter how old we get, we are always our parent's baby. Its only natural that they'd be concerned. This doesn't mean they don't love you, but it may just be that they're not sure how to show it right now, because their concern is so prominent.
It sounds like your friend Jerrod has some issues he needs to work through himself. It's clear that you're worried about him, but you need to realize its not you're job to hold everyone up on their feet. It's great that you have enough compassion to be so worried about your friend, but you need to TELL him that you're worried. You have to keep in mind, people don't change unless they want to. I definitely think you should tell him you're worried, and let him know you care and are there for him, but you also need to let go of your supportive instinct just a little, so you can work on your own task.
As for your ex Adam, I've always tried to look at it that if they're not treating you 100% with love, they're not REALLY worth perusing as a long term relationship. If it's not working out between you two, that's one thing, but he doesn't need to call you a poser. Name calling is just not nice, and is only magnifying the situation. Keep in mind, sometimes two people that work great together as friends don't work in a romantic relationship. There's nothing wrong with that at all, but realistically, that may just be the case here. Friendship may be a better option for both of you.
If you want to be friends, that's great!! You may need to be the motivator on that one though. Even send a text or an email. Just tell him you would like to be friends, but you understand that it will take time to get settled after the split, and for him to call or text you if he's ok with talking to you. It will leave the door open for a friendship, but not be too pushy. Keep in mind hun, even on the BEST of terms, a breakup can take some time to develop into a friendship. Patience is key on this one.
As for your cutting, it's not a problem to be taken lightly. I understand it can be hard to stop, but it's really important that you find other outlets for stress where possible. There are lots of safe ways to handle stress, with the same relief effect that cutting gives. If you're wanting to cut, try something else. You could listen to music, write in a journal, watch TV, call a friend, clean your room, make a snack, go for a walk (exercise is a GREAT stress release), draw on paper, or anything else calming to you.
In addition to trying to find an outlet, its important to tackle the issue of WHY you're feeling the need to cut. If you don't start working on what's bothering you so much, its going to be even harder to stop. Whether this means you talk to a friend or a close family member, a school counselor, a therapist, or whoever else, the bottom line is that you need to start helping yourself get better. Only you can change you.
Remember: You ARE loved, and you are NOT alone, EVER. It may feel like you have the weight of the world on you, but it's ok to pass some of the weight and ask for help when you need it.
I hope this helps a little, and feel free to PM me if I can help any further.
CrackerJax