Am I missing somethingFollow

I have what appears to be a strange play style. My warlock is currently level 35, and I have very rarely grouped, and never ran an instance. I do sometimes do BG's, but I am not great at them yet did my first few at 29 and will probably not stop in upper 30's because I want to get my horse too bad. The thing most people find odd is I do not do very many quest. I have done all my pet quests, and if a item looks good I will do the quest for it but if the quest is just a few silver I feel like I can get more exp and make more money just grinding and I love grinding yeah I know that is weird. My question is if I continue to play this way and do pretty much the solo thing, will that make things harder for me in the end game world. I am a quick study I played a lot of EQ and I used to be on the MT healing rotation with my cleric on a major raiding guild so I do know the basic dynamics of group play and I don't think it would take a rocket scientist to figure out a warlocks job in big groups, but as far as gear would I be way behind other players by not doing instances until the end?

You'd better get used to the idea of grouping/raiding because, as you probably know, most of the worth-while items (and above) are not available to soloists. Most items are earned through cooperative work in a guild over time, so I would definitely suggest finding a guild (you're at around the right level to look for a guild to dedicate to) and then just continue your playstyle-- of course, while still adhering to guild rules and being active. Once you get to the raiding levels (55+), then your playstyle will most likely change.