i don't think you're whining, ruining anything, or otherwise purposefully putting yourself in a position to feel lonely. humans are naturally social- so of course you want people to care about you, there's nothing wrong with that. i wouldn't call your behavior annoying or attention seeking, because everyone needs some level of attention, and most people need help. so, even if you were 'seeking attention', this is not a negative factor to your personality. it's just you being a person who wants help and comfort. for what it's worth, i'm glad you're still here, though i am sorry for your suffering and the pain of failed attempts.
if in fact no one is taking you seriously and no one gives you the necessary comfort anymore, then im sorry that your ex friends were so callous. i understand everyone has a limit to the support they can give- but friendships are supposed to be a give and take. sometimes, your friend needs more than you do, so you give more. and sometimes, vice versa. no friendship is always 100% equal, weight is always being given back and forth eternally, and accepting this and welcoming the chance to help is part of loving your friends.
even if you were corny or an edgelord, i doubt these people have spotless records. the truth is, everyone is a little annoying, and even those you love deeply will someday piss you off or say something stupid. i've had moments where my friends, beloved as they are to me, have truly and honestly gotten on my last nerve. i'm sure i've been the same to them a few times before. as long as you weren't actively abusing anyone, i don't see a reason that you saying something edgy or corny should write you off as a bad person or a bad friend.
i guess what im trying to get at is it's about the people you're around rather than some commentary on whether you're bad or not. for example, if my best friend was constantly venting about wanting to kill themselves, i'd 100% rather hear about it for the next 5 years over and over even if they never went through with it, instead of letting them suffer alone. we're not meant to go through life alone, we're not meant to sit around never 'bothering' anyone. i hope you find people that are okay with you 'bothering' them- this will always be preferable to you being dead, because they should love you enough to want to listen. best of luck