Ok well first off I'm new to this site and read some posts that made me want to join this site cuz I have some major issues with my SK's that I need help on!!

I've been married for 8yrs now and my Husband has 5 girls before I came along. They are now 24,22,21,16,14.. From the beginning there have been problems between his kids and I.. mostly his oldest in the beginning she didn't like change and someone taking all her Daddy's time.. so that relationship with her was a bust from the start there was no trying on her end and I gave up on trying as well.. it also broke his relationship with her too.. as for the other 4 we've had our ups&downs but got through them.. now I get along great with the 22&21 y/o but have no relationship with the 16&14 y/o.. the 2 youngest ones are always on there Dad about Me and talk so much sh*t about me n are always putting me down n calling their Dad down cuz he's still with me.. ok I have 2 kids of my own and another on the way that are all my husband's kids.. I have made mistakes in the past n learned from them and my babies suffered a bit cuz of my mistakes and my husband almost left bcuz of it.. bt I learned my lesson n now we're getting back to happy again.. so this is the hurt his kids bring up everytime they're mad at their Dad cuz I messed around n had babies(which are his btw) and he's still with me n not at their beck n call all the time.. this bothers me so much I sometimes just want to give up n leave this marriage cuz its so stressful n I hate to say it bt these 2girls I wish would leave us alone for good!! Then I feel bad for feeling that way.. my husband and I are always fighting bcuz of this and it has put such a strain on our relationship that we have almost ended a few times this past summer! I love My Husband very much he's my soulmate and my best friend n I don't know what I'd do without him so I honestly don't want us to end bt I do want peace!! See the tother thing that bothers me is I know deep down his kids n I will nvr have the ideal relationship of stepmom/daughter bcuz of their BM she has to put her 2sense in everywhere n is another reason why we don't have a relationship now cuz she's filled these kids heads with so much hate for me its ridiculous!! She always has something mean or bad to say about me and their Dad.. ex: when she found out a few yrs ago the kids were starting to call me Mom now n then she lost it on them all n made them nvr call me that again.. so to this day they don't!! I really need someadvive on what to think.. or do.. or say.. or something.. I'm at the edge ready to jump if I don't figure something out soon.. I'm so tired of being stressed out and tired of all the drama his kids bring into our lives n my babies lives as well..
Someone HELP!!!!

Thanks for listening to my vent for today!!!