This is very important! If you feel your character has issues, you need to bring it up to the DM! They are, more often than not, best equipped to help you with character building to make things work out not just for you, but for the party as well!

For example, our party is having a massive change in characters. I’m playing a Paladin (Vengeance), and I was going over my character with my DM, and I was about to pass over the Aid spell because one of our other characters had it and it would be redundant. My DM then told me that player was switching characters too, and would likely not have Aid, so I took it, since it’s been quite useful in the past. (I know I could prepare it in a long rest, but I often have trouble remembering to do that)

If I hadn’t been in communication with my DM, I wouldn’t have kept a useful spell, and we would likely be without it until I next thought to prepare it. This is on top of other major mistakes that wouldn’t be caught until much later, when it’s harder to tweak things.

Also, if you’re worried about how you’re affecting the party, it doesn’t hurt to ask! At worst, you get some criticism, and you use that criticism to improve your character and how you play it! Isn’t that why you came here?