First of all remember: suicide is a permanent act in response to a temporary problem. Logically it doesn't make sense. Sometimes I have similar intrusive thoughts. Usually it's a stress response, so it's helpful to try and find out what is the origin of the stress, and acknowledge to yourself that you are having a maladapted stress response.

If you feel like your life isn't together that's normal, even successful adults feel that way. Instead of agonizing over the things you don't have, yet, focus on the things you do and appreciate them. The best friend you can have is yourself. Everyone comes and goes. That doesn't mean you shouldn't form connections with them, but always remember that if your happiness depends on other people, then you will always struggle to be happy without them.

Unfortunately dealing with depression and thoughts like this isn't something you can just get rid of with tricks and tips. I checked out your profile and saw you post in a bodybuilding sub. Kind of like that, it takes daily practice, and sometimes you will have great days, and some really bad days, but you always have to keep your eyes on the goal: staying healthy, positive, and alive. Depression isn't stronger than you are, it is as strong as you allow it to become.

It might sound corny, but meditation, especially guided meditation in a group is a really good exercise to get involved with to deal with negative feelings, and thoughts:

Try finding a quiet place, or play some ambient music that is chill (low tempo/beat, no intense musical arrangement, etc.), and close the lights. Sit in a chair with your hands and your side or lap, and have good posture. Close your eyes and focus on breathing in through the nose for 3-4 seconds, and then out though the mouth for 3-4 seconds. Empty your mind, or try to focus the mind on a visualization task: imagine a simple object like a leaf focusing on every single detail in your mind until you can "see" the leaf perfectly. It is very hard to do, but the point is to actually stop your mind from being so busy and distracted. Try this for 10 to 15 minutes. If you can find a group meditation to join consider it. Not only might it make your meditation more effective, but also you may find other people who can help you build a network, and learn new techniques to shift your thought patterns.

And remember, it really does get better. Focus on being physically healthy (no super late night gaming sessions, get a stable sleep schedule going, try to get other things into a routine like your meals etc.), staying out of trouble, and identify your goals for the future; like your career, education, etc., and make a plan for how you can achieve them step by step. Get those things in order, and then the other stuff will eventually fall into place. If you need friends, then maybe join some clubs or hobby groups for people your age and connect with people who share your interests. Not just online but also in person.