Is it normal that i don't seem to trust anyone?

I notice that every time I get into a relationship of some sort (or start to have feelings for someone), either the relationship doesn't feel right for me (like, I'll have some feelings for the other person, but not enough to get into any sort of commitment) or, I completely do not trust the other person at all the more that I like that person. At first, things will be going great, then the relationship will feel strained or something, but I'll like the other person a lot, to where I'm thinking of her almost the entire day (which produces a sort of nervous feeling for me), and then I'll have major trust issues, my insecurities are a little more intense, and I'll want to distance myself (I guess to avoid getting hurt or betrayed). Even when the other person says that she has feelings for me, I'll still think that I'm more or less wasting my time. Is this normal?