Is she becoming distant with me or am I overreacting?

So I guess I have a few questions rolled into one. I'll do my best to explain, My girlfriend and I have been together over six months and it's been pretty fantastic. We did however have a bit of an issue back in December when she sort of came out of nowhere with a bunch of complaints about me (how I should have a better job, should have more careers lined up because I was graduating, should be moving out of my family's house), but since then, things have been very nice. To give some highs and not come off as a downer, in the past month I've been going over her place almost everyday, met her parents and most of her family, and we try to go out on the weekend to different diners to eat. Usual stuff. A few weeks ago she got me a card that said something about how she's been super happy with me and can't wait for our future. Yay. This week we have a trip booked to go out of town for a few days and we're both pretty amped about it. However, this past week or so... I don't know. All of a sudden I got some vibes that she was unhappy with me. We don't have sex as much as we would like, both living at home (her parents are pretty protective, so we can barely do anything when I'm over, but my portion of my home is big enough. I invite her over but she's either really busy or something). It's nothing where one of us deny the other person. The no-sex thing bothers the both of us and it's been a long time, so I'm afraid its making her unhappy. We 'celebrated' our six months the other day. We both worked but she texted me that morning to tell me. We're not anniversary people (she especially isn't) so I was surprised to see her tell me that. I ended up bringing her some of her favorite foods for dinner at the end of her shift and we got drinks afterward. Aside from our little milestone, neither of us have ventured into the "L-Word". Again, I feel like not having said it might make her feel like we aren't going anywhere? Although I do want to say it, I'm just insanely worried it won't go over well. But again, this past week... I feel like I've barely seen my girlfriend. I feel like our phone conversations are awkward. Although she did tell me before this past weekend that next week before our trip, she's gonna be really busy. I had a really bad day the other day and laid a lot out to her, how I feel like a bad person/boyfriend for still not getting a better job, although I apply to ones day in and day out. About how I'm generally upset about myself and a lot of other things lately and was a little concerned about us. She got really concerned and told me I should't feel that way and things will be, as she promised, okay. And that I have her. This made me feel better. We still talk about our trip this week, which is nice. She's told me about the stuff that she got for our trip, but all day again today... I felt like we've been growing apart, or shes distancing herself. Or is this normal after 6 months? Haha. Normally she calls me before she goes to bed but tonight.. nothing. I called her and said goodnight and that I missed her today. She said she knew but "at least we'll see a lot of each other at the end of this week. So there's that" I don't know, some days I feel like there are less of us talking the way we normally talk and there are some moments where she reassures me. So yea, maybe I'm reading too much into things? Should I be doing something?

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