Totally normal.
Instructors vary quite a bit in their approach to stripes, (some don't even use them), but it typically will take 6-9 months to earn your first stripe. Don't even worry about that for now.
Don't expect to succeed in getting submissions just yet. You've been training for 3 months. Your sparring partners (judging from their ranks)have anywhere from several months to several years more experience than you. They should be consistently dominating you unless you are exceptionally talented and athletic.
The advice I give people is not to focus on who you can or can't "beat" in rolling. That mindset leads to frustration and slower progress. You need to focus on smaller steps and smaller victories. The following should give you an idea of how to approach your progression while rolling.
1) Starting out. You find yourself in a certain position and you have no idea of what to do from here. Victory condition - attend classes and ask questions until you learn something you can try in that situation.
2) You find yourself in that same position again, having learned something to try from there. In the heat of the moment you can't remember what technique you were shown to use in that position. If you do remember, it's too late. You've hesitated too long and the situation has already changed. Victory condition - after the round mentally review what you should have done. Get in some extra reps with a training partner. Visualize going for the move next time.
3) You find yourself back in that same position and you try the appropriate technique you've been shown. It doesn't work - probably because you've messed up a number of important details under stress. Victory condition: First, give yourself a gold star for remembering and trying an appropriate technique. Next, identify at least one detail that you got wrong when you tried the move. If you can't figure that out yourself, ask your instructor or your sparring partners. Visualize getting that detail right next time. Next time you roll, your goal will be to get that one detail right.
4) Congratulations! You ended up in that position again, tried the technique and got that troublesome detail fixed. Unfortunately it still doesn't work because you've forgotten or messed up other details. Victory condition - keep repeating step 3 with additional details until you start consistently attempting an appropriate technique with a reasonable degree of skill and correctness in that position.
5) Now that you can consistently attempt some moves under pressure with good technique at the appropriate time, they sometimes work for you. Yay! However, often they still don't work because your sparring partner counters them with superior technique or athleticism. Victory condition - start learning the counters to the counters. Start learning multiple moves for the same situation and how to use them in combination. Start learning how to disguise your intent so your partner doesn't know what move you're going for. Expect all this to improve in small increments, just like the previous steps.
6) As above, but everything just keeps getting deeper and more nuanced.
TLDR - your victories don't come through tapping out your training partners. They come by incrementally improving the quality of your own movements. If you keep making those incremental improvements, you will eventually start getting those submissions.
BTW - even as you get better, you will still feel like you suck. Even after thousands of hours of training and earning my black belt in BJJ, I still feel like I suck on a regular basis. All that changes is that your standards improve and you start sucking at a higher level.