Me [23 F] with my boyfriend [23 M] of 3+ years, only wants to see me 4-6 hrs a week.

I've been in a relationship for over 3 years now with an incredible guy that I love and who has been there for me in so many ways (helping me develop as a person and in my career, planning fun vacations/trips for us, taking care of me in my worst moments and just understanding me as a whole). He's an incredible communicator and problem-solver. As a result, there aren't many issues between us that we can't work out but the one recurring point of tension between us has been our differences in the amount of time we want to spend together.
In the beginning of our relationship, we were in a long-distance situation for 1/3 of the year due to school breaks, and during those times we would talk as soon as we got home from our internships until we went to bed, every single night. When we were together at school, we lived about a 6 minute walk apart and would visit each other nearly every night. Three years later, we now work full-time and live just 30 minutes away from each other, but the time we spend together has dwindled down to a 4-6 hr hangout, once/week. We do text sporadically throughout the day and call each other for at least 20 minutes on most nights, but in person it's only once a week, sometimes twice when he's up for it.
I learned over time that he's very very introverted and is easily drained of energy when being around others. Especially now that he works full time in a high-pressure environment, he comes home very stressed and always prefers to decompress alone. I on the other hand could be around him every single day without a problem (not that that's what I want out of him but just to give you an idea of what I'm comfortable with).
Now that we're in our early twenties, our life focuses have shifted away from our relationship and more towards our careers/personal goals, which is part of the rationale behind the amount of time we spend together (or lack thereof). I strive to be respectful of his needs, and the fact that I should be happy knowing that he feels happier when he gets the alone time he needs, but it has slowly started to make me feel incredibly lonely. I try to direct my time to other activities for myself like learning a new instrument, reading, cooking, seeing friends, and while I do enjoy those things, it never fails to make me a little sad that I only see him for a few hours a week. I think about all the other positive things about him as a boyfriend whenever I feel this way and the fact that it's not about me and that it's just who he is as a person, but it still makes me unhappy always feeling like I might be suffocating him. Now when we see each other, I feel anxious about how long we should hang out, unsure of whether I should tell him to go home and relax and struggle to let go of the feeling of wanting more time together. I've talked about this with him so many times that I know his stance on the issue and feel secure in his commitment and feelings towards me, but the lack of physical time together continues to bother me day to day.
I don't know how to stop feeling like this... Advice from anyone who has experienced a similar situation with an introverted S.O. would be super appreciated!

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tl;dr: Boyfriend of 3+ years is very introverted and only wants to see me 4-5 hrs a week, leaving me feeling very lonely. Picking up new hobbies, spending time with other friends, doesn't distract from my sadness about how little time we spend together. What can I do to work on this?


Source.

If i didn't HAVE to be in a relationship where i only saw my man 6 hours a week, i dang sure wouldn't be. Doesn't sound like much of a relationship to me.

The OPs long, rambling post screams clinginess....I wouldnt wanna be around her much either....