I'm thinking of telling my girlfriend that I'm perfectly fine waiting till marriage but it really bothers me.
Why does it bother you to tell your girlfriend to wait till marriage?
Because it feels as if I'm forcing myself to live by a lie.
You shouldn't be pressured into taking such a big step before you're ready. You need to have a talk with your girlfriend.
Well I guess.
If they are committed to the relationship and care about you, then they will understand your point of view. Relationships are built on respect and if she shows she understands you, then you two will feel even more connected.