Dear Christina,
The last thing you should do is lose hope.
It seems that your problem is mainly that you have no-one to turn to and open yourself up to about your vocation in order to receive sound advice. Outside of that, you seem to have inklings of the vocation yourself yet you are not sure, you are frustrated with your present job, feeling unfulfilled, and people keep saying you would make a great sister.
Lets look at the positive elements in all of this. You have not closed your soul to the vocation, you have not rejected it. That is important. You are searching and the search is coming from inside your soul, it is not yet at rest. That is also good. You obviously want to do what is right. And you realize that on your own you are likely to make a mistake. All of these too are on the positive side, they are working in favor of you finding the right answer.
Lets look now at the negative, and I can only see one: you dont have a spiritual director you can work with.
There are several ways to find your way out of this problem. One, perhaps the simplest, is to look up a religious order that interests you and go speak to the vocations director. Also, if you let me know where you live I may be able to connect you with a qualified spiritual director. Thirdly, you may want to take the bold step of directly approaching a local priest who has a good reputation as a confessor, and ask him if he will direct you.
God bless. Be sure of my prayers.