First of all, there is a topic called General Thread - Build Help, so please stop making new threads every time.
Secondly, DO NOT MYTH AVENGER
Thirdly, for rank 15, they’re not bad. You don’t have to use every weapon slot. If you transform your torsos like Zarkares and Hollow and Lightning Vest you will become a very good player.
Fourthly, you don’t need 3 Mechs right now, you’re only at rank 15 and probably aren’t getting to rank 5 or below any time soon.
Last of all, send a pic of your entire inventory so I can help you make a better build.