I think being a step parent is harder than being a parent. No matter how many books there are on the subject, or how many people advise you, nothing can prepare you for it. It is something that hits you between the eyes, stings and smarts then in time you get used to it and become more "immune"... or not, thats when one bows out for the finale.
Counselling is a wonderful attribute we have added to our lives. It works if you want it to. Many replies here tell us that honesty hurts and boy, it does... but any sort of counselling involves honesty. This is the only way we can truly find out who we are and how to deal with the issues we find in ourselves which are damaging us. The first and most important step is acknowledging the fact that we have issues which need sorting.
I have to say that I hate being a step parent. I have learned to cope with that feeling by looking at it as an emotion and turning that emotion into something good. I disappear for a while, spend time with my mum and on my own at the stables etc... I get out of the situation which causes me greif.. just for a bit. My feelings can be felt by the skids... that can't be good for them or their dad, so I don't drain them with it.
DH and I are considering relationship counselling as it is a particular problem of dhs that he finds it difficult being a father/stepfather and husband. It is a first step to sorting a problem. Hopefully it will work and get us back on track, if not then it will be sorted either way.
Go for the counselling but be honest with yourself. It may/may not help you but you won't know til you try.
Hugs to you hun, it isn't easy at the best of times. Keep strong and find your own boundaries. Just because we are step mums/parents does not mean we are super human or that we have to accept every bump that comes our way.
We are human... only human.
HUGS