Hmm, well...I think I offered some vague suggestions in my earlier post, but to offer a more specific answer to that particular question:
Could you try putting yourself in the position of the "tool"? That doesn't sound entirely serious, but it is -- not a good rule to use across an entire relationship, but it could work in some situations or in terms of accomplishing a certain objective. By this I mean -- find out what someone else wants, and make their objective your own. Objectives are just objectives, and while people place more importance on their own by automation, really everyone's objectives have about the same weighting and you can train yourself to see it more like that. Even if it doesn't fully interest you, try to imagine that it does, or why it might, or at least do it as an experiment.
Do you like animals? In terms of interacting pleasantly with people, the same kind of core principles apply (you are nice to them, they are nice to you, there's an exchange of something and both parties end up feeling good) but obviously with rather more intricate social rules, seeing as you cannot generally go up to another human, pet it on the head and expect it to purr, or other such things -- you can however say hi and smile and they might return the gesture to a similar effect.
People are something to explore. They are not an object to manipulate into achieving an objective, but, if you are forming a friendship or other relationship with someone, you are combining simple interaction (one person says or does something, the other responds appropriately, both learn or get something out of it -- company, validation, whatever -- both feel good) with exploring the person. Think of it as taking apart a complex piece of machinery (...but please don't actually take people apart), looking at all of its different parts and beginning to understand how it works. Maybe humans are just complex machines, with thoughts and wants and feelings. You can begin to understand someone in terms of this, but just remember that you are just as much a machine as they are, and if you would not want to be used or manipulated or hurt, neither would those with whom you are interacting.
In getting to know you, they, just like you, are exploring you, deconstructing you, seeing how you function in certain situations and how you respond to certain stimuli (provided by them.) So yes, maybe thinking machines (while taking into account your own status as one, and remembering these particular machines can suffer and this matters) is a step up from thinking tools. You will never fully understand the workings of another human, probably never fully understand your own either, but interaction is a good way to gain at least a better level of understanding than none.
People do tend to "use" each other to accomplish objectives to a certain extent, but in a friendship maybe it's better to see it as sharing objectives. It has to work both ways. If someone opens up to your objectives, you need to try to open up to theirs; if someone is trying to understand your workings, you should return the favour. Because the overall objective is to make life better or at least smoother and more bearable for everyone and to reduce rather than to cause suffering for both others and oneself. If you cannot understand or accept the last part, the other posters might be correct in that this isn't the right forum.