I think you should consider ending this relationship for several reasons. If she wants to experiment with dating girls then she is having second thoughts about her sexuality. She could be bisexual or a lesbian and there may not be a place for you in this scenario. The other reason is if she is avoiding questions about her feelings then that is probably a sign that she doesn't know how she feels about you. In a healthy relationship people know how they feel and they know what they want. She seems to not know either. This is a sign that her feelings aren't as strong as you want them to be. That could mean disaster as you put in more time and things don't work out. If she is saying you need to wait 2 years from now that says that you have to wait for a commitment for that long while she experiments sex with other people. She needs to know what she wants before a relationship can be successful. If you try it her way you will be waiting on the sidelines for years. Make a decision to let her go at least until she knows what she wants.
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