I need a little advice and guidance for an online relationship I have with a girl. I'm not really the greatest at explaining the things I'm trying to, so I will do my best not to skip over anything too important.

I began dating a girl that I met online through a game. We have now been dating for over 3 months, and are very much in love with each other. We talk at least once a day and video chat for a few mins before she heads to bed, and when we are both free after school sometimes. We lived quite a ways away, but I planned on seeing her this summer. I'm so happy when I see her, and she is just as happy when she sees me in the video calls. We sometimes can talk for hours on end. She is practically perfect to me in every way, and she says I am to her as well. There's only one issue I have with her, she seems to have A LOT of other online guy friends that she frequently talks to. She is always constantly being messaged from multiple people daily, and when we are talking on skype to each other, I hear every message that comes through, and she seems distracted a lot of the time. She talks to them for hours and hours sometimes, which is quite more than me and her talk. I've numerously asked her why they message her so much, and she just says they are close friends. She hardly plays games with me like she used to, we both seemed to enjoy them in the past. Now she is mainly just playing games with these other guy friends, and lately that has been frequently. She will call me for around 5 minutes then say she has to go to another call, and she might spend hours in it with another guy or group of guys. At first, I tried to ignore it and just be happy that we talked and stuff, but I've begun noticing things I'm not liking. She doesn't really hint at what they talk about, and when she shows me her screen on skype like we do with each other for like picture surfing and watching videos together or something else, I notice that she is getting messaged like I thought constantly. She turns off her screen share in order to message them back, which means she doesn't want me to see whatever it is they are saying. I get that she needs space and privacy, but where should I draw the line on how much she talks to numerous other guys and sometimes spends more time in calls with them than me? I'm a bit insecure about it, and I let her know that I get a little jealous when she spends more time with those guys than me. She says that they are just friends and that I'm the only one she will ever love. Sometimes when I get upset that she said she had to go to another call with her friend(s), she promises me that the next day will be all about me, and she won't get distracted with the other guys. The only issue with that is she she has broken it 4 times now and ended up making an excuse to go talk to them. She seems to be getting more distant from me sometimes, but when we video chat I feel like we are both really in love. I'm not sure if things in my head are just messed up or not. Lately I feel like she is lying to me about some things. The other night, she was keeping her promise of talking to only me that day, and she wanted to 'go to bed early' which was around 8:40pm her time. I thought that was a little strange of her, because she never goes to bed that early. She told me goodnight, but when I checked to see if she logged off her computer, it showed her steam was still online. It was on until almost 11pm, which meant she never logged off her computer for the night as she normally did. In my head I feel like she lied to me in order to talk to someone else. Today when I got home she called me for about 5 minutes and she was telling me about her ex that was making her upset, then said she had to go back to another call. This means she still keeps in contact with her previous ex boyfriend. I told her that if he is upsetting her, she shouldn't talk to him, but I doubt she did stop like she said she would.

Anyway, for a brief summary of what I'm trying to ask is should I be worried that my girlfriend talks to a bunch of other guys online other than me? Am I being too insecure about it? Should I just let her talk to them, and ignore any negative feelings I get from it? Am I right to think that she shouldn't be spending more time with her other guy friends than with me? Even I can tell that I'm coming off as possessive and such. I've told her already that I'm always going to be a little upset that she talks to so many other guys, and I'd rather her talk to me. She said she'd try her hardest to talk to me when she can, and that she always wants to talk to me, but has friends that are depressed and she wants to help them. Any advice on how I should proceed would be greatly appreciated.

*Update 1: After re-reading this, I noticed I left a bit out, but I don't have too much time to think of it all and add it in at this time, I'll try to soon!