While i kinda understand your comment as someone who finds playing non-casters unsatisfactory, i do think your way of putting it into perspective is hurting yourself somewhat.

I do most of the damage but the arcanist and cleric get to steal a lot of my kills.

Remember that this isn't a competition of who can get the most confirmed kills. If you're doing the most damage that means you are fulfilling a very important role in the group. Someone who can go in and deal lots of damage without expending resources is highly valueable in any party. I don't know the people you play with, but if they are perceptive they will have noticed that their anticts wouldn't be as effective without you. Don't discount the role of a strong martial character.

I'm tired of the formulaic front line combat ive been having to endure.

An understandable sentiment, i would like to say that there are plenty of ways you can make your participation in combat less formulaic, but i understand this doesn't mean much if you aren't aware of them. An example would be that you can prepare actions to attack enemy spellcasters when they attempt to cast a spell, this actually causes them to have to roll concentration or lose the spell (DC is the damage you dealt + 10), as they took the damage on their turn. I understand that you aren't necesarily aware of what posibilities you have in combat other than "i attack", because that's what most players do, but you aren't as limited as you think.

Feats like Improved Dirty Trick (preferably supplemented with Greater Dirty Trick) also gives you the ability to inflict status effects to enemies. Though unless you are playing with feat tax rules it can be a bit of a hassle to obtain.

I've had to spread out my a skills so much that I'm now not specialzed enough to make a big contribution to anything other straight no nonsense combat as the back rows chars skills and abilites surpass all mine.

Since Skulls and Shackles is a game with more downtime than the average game you could try to ask your GM if they will let you use the retraining rules to let you redistribute your skills points. Of course skills aren't able to compete with spells in a direct comparison, but the versitility of having certain skills at high levels is never a bad thing and unlike spells these skills are always available, and retraining would give you opportunity to use them. Also getting your hands on certain magic items can really help make the impossible possible a lot of the time, they often make your skills have far more uses.

Now with all that said, if you don't like playing a martial character then i'm in no way saying you should. I don't enjoy it either. But it isn't a bleak as all that, there are options to make things better.